Hi Eagle, i can relate to shutting down in classes...it happens often to me and I almost always have to ask for extensions which I find really embarrassing because I used to always get everyhting done on time or even early...

I don't know about what you can do other than what Bec has already suggested...
But...maybe you can get the school counsellor (if you have not done so already) to write a letter to your profs and tell them to take your situation (w/o giving any details of course) into consideration and give you extensions or whatever if possible...maybe it can at least lessen some pressure until you can get help....It's tough also to go to school and therapy...but hang in there. Good luck!