Oh, Raddy, feeling so badly for you both...
I agree with master of none, completely--regardless of his behaviour (good, bad, whatever), he doesn't deserve to be bullied, and the school needs to step up to the plate and make sure it doesn't happen--that is THEIR responsibility.
I don't have any experience with psychologists, but I am wondering if you do go to see one if you couldn't turn it around a little, and work out with that person a strategy to make the school see the ways in which they are failing your son? I'm not putting this very clearly, but what I'm trying to get at is that it may well be the school which has the "underlying issues."
Hope something works out soon--is it almost holidays?
peace
minnie