feeling so down.

Lately I haven't been feeling it. I've completely gave up on school, considering dropping out. Quit my jobs. About to break up with my boyfriend. I'm just completely shutting down. I'm just tired of being tired (if that makes sense). I just wanna be completely happy with my life. I talked to my doctor about postpartum depression (I'm 18 with a 5 month old) but he thinks it's my birth control (depo shot). I'm not even sexually active but I have ptsd when it comes to pregnancy because my pregnancy was horrible & I never want to experience it again so I'm staying on birth control until I'm old enough to get my tube tied. All I do is stay in bed. I've been thinking maybe vitamins will help me get up & go but idk