Depression is a disease of the soul and is the most dangerous that a human can suffer because it destroys us slowly with diseases.
When I feel in one of those episodes of depression I pray to God and I look for reasons to overcome it. One technique I use is to stare at the mirror and look for beauty in my eyes and tell myself how much I love myself. It's something magical because then everyone around me can notice my change, my desire to live.
Best regards