Du'a when feeling overwhelming sorrow

اللَّهُمَّ رَحْمَتَكَ أَرْجُو فَلَا تَكِلْنِي إِلَى نَفْسِي طَرْفَةَ عَيْنٍ، وَأَصْلِحْ لِي شَأْنِي كُلَّهُ، لَا إِلَهَ إِلَّا أَنْتَ

Allahumma rahmataka arju, fala takilni ila nafsi tarfata 'aynin, wa aslih li sha'ni kullahu, la ilaha illa Anta.

O Allah, I hope for Your mercy, do not leave me for even the duration of an eye blink (duration) and correct my total condition. Besides You there is none worthy of worship.

Sunan Abī Dāwūd 5090