FruityDragons: yes, it seems like part of it is the actual "going to school" piece, but not because of social anxiety, per se. He likes the social part of school. What he doesn't seem to be able to handle is spending a whole day at school and then doing work at home. When he's in good shape, he can complete most of his assignments at school. When he isn't, I'm not sure what he does all day except goofing off and spacing out. Then he has more work to do at home...becomes more overwhelmed...not a good system.

Yesterday, I kept him home for his first class and he finished the work for that class in a very short time. He is pretty fast when he's not exhausted.

I think school sucks all of his energy and there's nothing left for home. He just wants to be alone. I can relate to this--he and I are both pretty low-energy and I could never go to work all day and then continue to do THAT sort of work at night.