Don't be Sad
A man who had a mental disorder and an extreme anxiety problem sought advice from a Muslim doctor, who advised him, saying, "Know that no matter what the plans are that someone has for the future, there is no movement, not so much as a whisper, in this world but that it occurs by the permission of Allah."
The following is related in a hadith:
"Verily, Allah wrote the Maqaadeer (everything that will happen) of the creation fifty thousand years before He created them."
"Small things are greatly magnified in the eyes of the small one, And great things are diminished in size in the eyes of the great one."