I'm Afraid I Have An Eating Disorder

So I'm really afraid I have an eating disorder. I didn't think about it before until I read a self help book where a girl says she has a binging eating disorder. And I've been thinking about it and I think I might have that same disorder. I eat and eat until I feel like I'll vomit or until my stomach is in so much pain it's hard to move. I eat like it's my last time eating, and when I don't eat that much I'm hungry. What doctor can I see about it? How do I bring it up to my parents?