The greatest antidote to depression, the greatest way to feel goodness in your heart is to read surah ad -Duha. It is the surah which tells you to be positive and feel good about Allah (swt). 

This surah was revealed at a time when the Prophet (pbuh) did not receive revelation for 6 months. The Prophet thought Allah did not want him as  a Prophet. We all get these thoughts like “Does Allah love me” “look at the way my life is going what does Allah want from me?”. 

Allah tells the Prophet that he will go to jannah, He promises us jannah, and then gives us reasons to believe in Allah and to believe in His promises, Didn’t Allah find us lost and guide us?