Oh dear hun, I can imagine how stressful and upsetting the situation you find yourself in is for you. I'm twice your age but don't think i would or could discuss such problems in front of my father. Is there a close female friend or relative that could go with you. Your father could then drive you and sit in the waiting room etc. If not perhaps sit down with your mum or school nurse and discuss your worries they maybe able to come up with a solution. Big hugs