When ever Prophet Muhammad sallallahu alayhi wasallam see a problem or difficulty or hurdle, Recites following Duas prayers.
So if you have any problem, difficulty, hurdle then recite any of the following.
اللَّهُمَّ رَحْمَتَكَ أَرْجُو فَلَا تَكِلْنِي إِلَى نَفْسِي طَرْفَةَ عَيْنٍ وَأَصْلِحْ شَأْنِي كُلَّهُ لَا إِلَهَ إِلَّا أَنْتَ
"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".
حَسْبُنَا اللَّهُ وَنِعْمَ الْوَكِيلُ
"Allah is sufficient for us and He is the Best Guardian".
اللَّهُ اللَّهُ رَبِّي لَا أُشْرِكُ بِهِ شَيْئَاً
"Allah is my Lord, I do not ascribe anything unto Him".
يَا حَيُّ يَا قَيُّومُ بِرَحْمَتِكَ أَسْتَغِيثُ
"O Alive and everlasting One, I beseech You by Your mercy".
لَا إِلَهَ إِلَّا أَنْتَ سُبْحَانَكَ إِنِّي كُنْتُ مِنَ الظَّالِمِينَ
"O Allah, there is none worthy of worship besides You. You are Pure, definitely I have oppressed my soul by sinning".
The Qur'an states that these words were recited when Yunus (A.S.) called upon Allah from the belly of the fish. Prophet Mohammad (S.A.W.) stated in a hadith that when any Muslim makes this dua via these words to Allah, then Allah surely accepts his duas.
لَا حَوْلَ وَلَا قُوَّةَ إِلَّا بِاللَّهِ
This is the medicine for 99 ailments, the least of which is depression.