At least the doctor will help you talk your parents about your concerns. It'll be easier with a professional to educate them as well. Talking to someone, like a school counselor will be helpful while you're waiting to see a doctor, maybe quell some of the anxiety? What were the things your friend suggested?

My parents were kind of the same way. : / It sucked when they found out. It sucked hard. But after they found out I got the help I needed, whether I liked it or not. I never utilized it, but it was finally there. The most useful thing, hands down, would have been to have utilized the therapy.