Writing a letter, with your parents' assistance, might also be useful.
As I told you in the other thread, I experienced similar treatment at the hands of my drama classmates - and yet I was one of very few students who got an A* at GCSE.
I credit my LAMDA training for part of that success. LAMDA stands for the London Academy of Music and Dramatic Art and it has freelance teachers dotted all over the world. Go to www.lamda.org.uk
and see if you can find a teacher in your area. The lessons you do with LAMDA are very different to your average drama class. You are taught the basics first (how to speak clearly and use your voice to reflect your moods, an art which is known as elocution) and then you move on to performances - usually monologues and duologues. The skills you learn in this kind of class will make you much more confident in your ordinary drama lesson.
If someone calls you a spaz, report it
. I know you may feel shy about approaching your teachers, but you must do it - not just for your sake, but for the sake of all dyspraxic students in the school.