Sorry to hear of your struggles. Forced social interaction can be an extremely stressful thing for anyone, add your particular set of issues and it can be downright unbearable, as it sounds it was for you today.

Try not to get frustrated. You said you're trying to go back to school. Through my college career I was made to work in groups for some courses just as in highschool. It was mainly for large research style projects though. The rest was individual.

But don't fear, I'm sure you could make arrangements to work independently. Not sure if you know any good relaxation techniques, but it sounds like you could put them to good use when you're in situations like you were today.

Best wishes and good luck