i'm sorry that you are having a hard time with that.........maybe if you take into account just how many times someone has gotten sick in your class.....probably not many...if any at all.......and you will realize that it doesnt happen very much it will relax you.......maybe if you tell the teacher you need to sit by the door and explain a little bit of your phobia they might understand.......although i never had the nerve to do that myself.

good luck......enjoy your school days......they really are better than work....lol