wa 'alaykum salaam Brother
I will share you some dua and dhikr In sha Allah will help you during your hardship.
Ibn 'Abbas narrated: "The Messenger of Allah sent Mu'adh [bin Jabal] to Yemen, and said: 'Beware of the supplication of the oppressed; for indeed there is no barrier between it and Allah.'" Jami 'at Tirmidhi
Abu Sa'id and Abu Huraira reported that they heard Allah's Messenger (ﷺ) as saying: Never a believer is stricken with discomfort, hardship or illness, grief or even with mental worry that his sins are not expiated for him. (Sahih Muslim)
It was narrated from Mus’ab bin Sa’d that his father, Sa’d bin Abu Waqqas, said:“I said: ‘O Messenger of Allah, which people are most severely tested?’ He said: ‘The Prophets, then the next best and the next best. A person is tested according to his religious commitment. If he is steadfast in his religious commitment, he will be tested more severely, and if he is frail in his religious commitment, his test will be according to his commitment. Trials will continue to afflict a person until they leave him walking on the earth with no sin on him.’” (Sunan Ibn Majah)
Narrated Ibn `Abbas:Allah's Messenger (ﷺ) used to say at a time of distress, "La ilaha illal-lahu Rabbul-l-'arsh il-'azim, La ilaha illallahu Rabbu-s-samawati wa Rabbu-l-ard, Rabbu-l-'arsh-il-Karim. (Sahih al Bukhari)
Narrated 'Ubada bin As-Samit:The Prophet (ﷺ) "Whoever gets up at night and says: -- 'La ilaha il-lallah Wahdahu la Sharika lahu Lahu-lmulk, waLahu-l-hamd wahuwa 'ala kullishai'in Qadir. Al hamdu lil-lahi wa subhanal-lahi wa la-ilaha il-lal-lah wa-l-lahu akbar wa la hawla Wala Quwata il-la-bil-lah.' (None has the right to be worshipped but Allah. He is the Only One and has no partners . For Him is the Kingdom and all the praises are due for Him. He is Omnipotent. All the praises are for Allah. All the glories are for Allah. And none has the right to be worshipped but Allah, And Allah is Great And there is neither Might nor Power Except with Allah). And then says: -- Allahumma, Ighfir li (O Allah! Forgive me). Or invokes (Allah), he will be responded to and if he performs ablution (and prays), his prayer will be accepted." (Sahih al Bukhari)
It was narrated that ‘Ubadah bin As-Samit said:“The Messenger of Allah (ﷺ) said: ‘Whoever wakes up in the morning and says upon waking: La ilaha illallah wahdahu la sharika lahu, lahul-mulku wa lahul-hamdu, wa Huwa ‘ala kulli shay’in Qadir; Subhan-Allah walhamdu lillahi, wa la ilaha illallahu, wa Allahu Akbar, wa la hawla wa la quwwata illa billahil-‘Aliyil-‘Azim (None has the right to be worshipped but Allah alone, with no partner or associate. His is the dominion and all praise is to Him, and He is Able to do all things. Glory is to Allah, praise is to Allah, none has the right to be worshiped but Allah, Allah is the Most Great, and there is no power and no strength except with Allah, the Most High, the Most Supreme), then he supplicates Rabbighfirli (O Lord, forgive me), he will be forgiven.’” Walid said: “Or he said: then if he supplicated, it will be answered for him then if he stood up and performed ablution and then performed prayer, his prayer would be accepted.”(Sunan Ibn Majah)
It was narrated from Abu Hurairah that :the Messenger of Allah(ﷺ) said: "Whoever says one hundered times each day: La ilaha illahu wahdahu la sharikalahu, wa lahul-mulku wa lahul hamduwa huwa ala kulli shayin qadeer (None has the right to be worshipped but Allah alone, with no partner or associate. His is the dominion, all praise is to Him, and He is able to do all things), it will be equivalent to him freeing ten slaves, and one hundered merits will be recorded for him, and one hundered bad deeds will be erased from (his record), and it will be a protection for him against Satan all day until night comes. No one can do anything better then him except one who says more.'" (Sunan Ibn Majah)
Abu Dharr narrated that:The Messenger of Allah (ﷺ) said: “Whoever says at the end of every Fajr prayer, while his feet are still folded, before speaking: ‘None has the right to be worshipped but Allah, Alone without partner, to Him belongs all that exists, and to Him is the praise, He gives life and causes death, and He is powerful over all things, (Lā ilāha illallāh, waḥdahu lā sharīka lahu, lahul-mulku wa lahul-ḥamdu, yuḥyī wa yumītu, wa huwa `alā kulli shay’in qadīr)’ ten times, then ten good deeds shall be written for him, ten evil deeds shall be wiped away from him, ten degrees shall be raised up for him, and he shall be in security all that day from every disliked thing, and he shall be in protection from Shaitan, and no sin will meet him or destroy him that day, except for associating partners with Allah.” Jami 'at Tirmidhi
`Umarah bin Shabib As-Saba’i narrated that the Messenger of Allah (ﷺ) said:“Whoever says: none has the right to be worshipped but Allah, Alone, without partner, to Him belongs all that exists, and to Him belongs the praise, He gives life and causes death, and He is powerful over all things, (Lā ilāha illallāh, waḥdahu lā sharīka lahu, lahul-mulku wa lahul-ḥamdu, yuḥyī wa yumītu, wa huwa `alā kulli shai’in qadīr)’ ten times at the end of Al-Maghrib - Allah shall send for him protectors to guard him from Shaitan until he reaches morning, and Allah writes for him ten good deeds, Mujibat, and He wipes from him ten of the destructive evil deeds, and it shall be for him the equal of freeing ten believing slaves.” Jami 'at Tirmidhi
Narrated Abu Huraira: Allah's Messenger (ﷺ) said, "Whoever says, 'Subhan Allah wa bihamdihi,' one hundred times a day, will be forgiven all his sins even if they were as much as the foam of the sea (Sahih al Bukhari)
It was narrated that Ibn Abi Awfa said:"A man came to the Prophet (ﷺ) and said: 'I cannot learn anything of the Quran; teach me something that I can say instead of reciting the Quran.' He said: 'Say: SubhanAllah, wal-hamdulilah, wa la illaha ill-Allah, wa Allahu Akbar, wa la hawla wa la quwwata illa Billahil-aliy al-azim (Glory be to Allah, praise be to Allah, there is none worthy of worship except Allah, Allah is Most Great, and there is no power and no strength except with Allah the Exalted and Magnificent ).'" (Sunan an Nasa'i)
Narrated 'Aisha: Whenever the Prophet (ﷺ) went to bed every night, he used to cup his hands together and blow over it after reciting Surat Al-Ikhlas, Surat Al-Falaq and Surat An-Nas, and then rub his hands over whatever parts of his body he was able to rub, starting with his head, face and front of his body. He used to do that three times. (Sahih al Bukhari)
Narrated Muhammad bin Sirin:Abu Huraira said, "Allah's Messenger (ﷺ) put me in charge of the Zakat of Ramadan (i.e. Zakat-ul-Fitr). Someone came to me and started scooping some of the foodstuff of (Zakat) with both hands. I caught him and told him that I would take him to Allah's Messenger (ﷺ)." Then Abu Huraira told the whole narration and added "He (i.e. the thief) said, 'Whenever you go to your bed, recite the Verse of "Al-Kursi" (2.255) for then a guardian from Allah will be guarding you, and Satan will not approach you till dawn.' " On that the Prophet (ﷺ) said, "He told you the truth, though he is a liar, and he (the thief) himself was the Satan." (Sahih al Bukhari)
Narrated Abu Mas'ud:The Prophet (ﷺ) said, "If somebody recites the last two Verses of Surat al-Baqara at night, it will be sufficient for him. (Sahih al Bukhari)
Narrated Abu Dhar: Whenever the Prophet (ﷺ) lay on his bed, he used to say: "Allahumma bismika amutu wa ahya," (With Your Name, O Allah, I die and return to life) and when he woke up he would say: "Al-hamdu lil-lahilladhi ahyana ba'da ma an atana, wa ilaihi an-nushur. (All praise belongs to Allah Who has restored us back to life after causing us to die; and to Him shall we return)" (Sahih al Bukhari)
Narrated Al-Bara' bin `Azib:Allah's Messenger (ﷺ) said, "O so-and-so, whenever you go to your bed (for sleeping) say, 'O Allah! I have surrendered myself over to you and have turned my face towards You, and leave all my affairs to You and depend on You and put my trust in You expecting Your reward and fearing Your punishment. There is neither fleeing from You nor refuge but with You. I believe in the Book (Qur'an) which You have revealed and in Your Prophet (Muhammad) whom You have sent.' If you then die on that night, then you will die as a Muslim, and if you wake alive in the morning then you will receive the reward." (Sahih al Bukhari)
Narrated Al-Musaiyab: When the death of Abu Talib approached, Allah's Messenger (ﷺ) came to him and said, "Say: La ilaha illallah, a word with which I will be able to defend you before Allah." (Sahih al Bukhari)
It was narrated from Mu'adh bin Jabal that the :Messenger of Allah(ﷺ) said: "There is no soul that died bearing witness to La ilaha illallah, and that I am the Messenger of Allah, from the heart with certainity, but Allah will forgive it." (Sunan Ibn Majah)
You can repeat as many times as you like during day and night :
hasbunallahu wani'malwakeel (3:173)
hasbiyallahu la ilaha illa huwa 'alayhi tawakkaltu wahuwa rabbu al 'arshi al 'azeem ( 9:129 )
la ilaha illa anta subhanaka inni kuntuminaz-zalimeen (21:87)
anni massaniya ad-durr wa anta arhamuarrahimeen (21:83)
anni massaniya ash-shaytan binusbin wa'azab (38:41)
rabbana atina fid-dunya hasanatan wa fil-akhirati hasanatan waqina 'azaban-nar (2:201)
rabbii inni lima anzalta ilayya min khayrin faqeer (28:24)
rabbi ishrah lee sadree Wayassir lee amree Wahlul 'uqdatan min lisanee Yafqahoo qawlee (20:25-28)
'ala Allah tawakkalna rabbana la taj 'alna fitnatan lil qawmi az-zalimeen Wanajjina birahmatika minaalqawmi alkafireen (10:85-86)
rabbi a'oothu bika min hamazati ash-shayateen Wa a'oothu bika rabbi an yahduroon (23:97-98)
Al Fatihah, Al Ikhlas, Al Falaq, An Nas, 2:255, 2:285, 2:286
Do your best to do ablution and offer salah whenever you can. If you are oppressed so much that you are unable to, Allah Most Knowing, remember He is always with the believers. May Allah keep you safe and keep your faith firm in Him.