Allah will take away his distress and grief, and replace it with ease.

"The Messenger of Allaah (peace and blessings of Allaah be upon him) said: 'There is nobody who is afflicted with distress or grief and who says:-

Allaahumma inni 'abduka wa ibn 'abdika wa ibn amatika, naasiyati bi yadika maadin fiyya hukmuka 'adlun fiyya qadaa'uka, as'aluka bi kulli ismin huwa laka sammayta bihi nafsaka aw 'allamtahu ahadan min khalqika aw anzaltahu fi kitaabika aw asta'tharta bihi fi 'ilmi al-ghaybi 'indaka an taj'al al-Qur'aana rabee'a qalbi wa noor sadri wa jilaa'a huzni wa dhihaaba hammi

‘O Allaah, I am Your servant, son of Your servant, son of Your maidservant, my forelock is in Your hand, Your command over me is forever executed and Your decree over me is just. I ask You by every name belonging to You which You name Yourself with, or revealed in Your Book, or You taught to any of Your creation, or You have preserved in the knowledge of the unseen with You, that You make the Qur’aan the life of my heart and the light of my breast, and a departure for my sorrow and a release for my anxiety.’

- but Allaah will take away his distress and grief, and replace it with ease.' He was asked, 'O Messenger of Allaah, should we not learn it?' He said, 'Of course, whoever hears it should learn it.'

(Ahmad (139/1), Ibn Hibbaan (2372), and Al-Haakim (509/1) Saheeh)