Beep. I've been throgh the deprssion wringer several times in my life too. First episode at age 15. I had no idea what the f was going on. Lately labeled as dysthymic (always depressed) with recurring sit depression waiting for bpII dx to rule out. Its in the family.
Anyway, this is one you've got to fight, okay. Its going to hurt and its going to slow you down but fight it. Extra visits to psy, reevaluate rxs. Now do everything you wouldn't usually do when depressed. Call friends, go out, treat yourself, exercise (must do), and stay busy.
It's not fair we have this and it's hard for them to understand. But make it work. Even if it's huge effort just to go for a walk, try. Go through the motions. I did it and so can you.
"My actions are my only true belongings. I cannot escape the consequences of my actions. My actions are the ground upon which I stand." Thich Nhat Hanh