18 years old and terrified; PLEASE HELP!!!?

I'm glad that you are going to see a doctor, this will help put your mind at ease and find out whats going on. Find a friend that is supportive and have her go with you. I don't think your mom is very supportive and I am sorry for that. You will probably have to have some tests and you will definitely need someone to talk with and lean on, please don't do this alone. Good Luck...........