I believe, I trust and I have faith in Allah. That is why I never get so depressed for a long time. This is dua is said when a person is depressed.
A Prayer to Ease Anxiety and Depression
It was reported from ‘Abd-Allaah ibn Mas’ood that the Prophet (peace and blessings of Allaah be upon him) said: “No person suffers any anxiety or grief, and says:
‘Allaahumma innee ‘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 anzaltahu fi kitaabika aw ‘allamtahu ahadan min khalqika aw ista’tharta bihi fi ‘ilm il-ghaybi ‘andak an taj’ala al-Qur’aana rabee’ qalbi wa noor sadri wa jalaa’a huzni wa dhahaaba hammi (O Allaah, I am Your slave, son of Your slave, son of Your female slave, 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 named 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 sorrow and grief, and give him in their stead joy.”(Ahmad 1/391 and Al-Albaanee declared it sahih.)
This works just like magic for me.