Wander...it's like that way for me as well except my breaks are only a matter of weeks. I'll go into a severe depression...come out for a few weeks then right back in. It's brutal I know. The poster before me had excellent advice about contacting your teachers for accommodations if you need them. Seeing your therapist and pdoc on a regular basis is great as well.
Just wanted to lend you my support and let you know I'm here to talk if you need to. Just PM me. You've won before...you'll persevere with this as well. Keep fighting.