wa 'alaykum as-salaam
I repeat these duas every time I am suffering from illness or other hardships, and Allah always grants me ease afterwards :
hasbunallahu wani'malwakeel (3:173) dua of Ibrahim 'alayhi salaam
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) dua of Yunus 'alayhi salaam
anni massaniya ad-durr wa anta arhamuarrahimeen (21:83) dua of Ayyub 'alayhi salaam
anni massaniya ash-shaytan binusbin wa'azab (38:41) dua of Ayyub 'alayhi salaam
rabbii inni lima anzalta ilayya min khayrin faqeer (28:24) dua of Musa 'alayhi salaam
Allah is the Truth, the All Able, He never changes, He was truthful then, He still is.