Cat, that's great news. Believe me, the doctor won't be hearing your problem for the first time, he (she) will be sympathetic and at least rest your mind by checking you out physically and make sure your diet isn't causing any physical harm.
I think it's a good idea to bring a friend (or husband) along with you for support so you won't feel so nervous.
Either way, you're doing the right thing.
You might want the doc to refer you to a counselor for followup as well, as the doc will not have any magic cure, just medical help/advice.