I understand why you feel you had to do what you did. Nobody was listening to you, and nobody would help you. That doesn't make it right, but you were just trying to protect yourself.
A lot of 'norms' don't understand what it is to deal with things like PTSD, or DID, so they tend to skip around those issues. Your teacher just sounds plain insensitive. Don't try explaining yourself to her, but if things do come up to the Dean, I would let him/her know what's going on with you. Maybe there's a possibility that you could do some extracarricular (sp) stuff to make up your grade. I'll keep you in my thoughts, as you deal with this. ((((cantbringmedown))))