I'm 13 and I'm not menstruating for a year and a half (I had it since I was 11. Then I started dieting and I had mild anorexia and I know it's probably because of that ... it makes me nervous because even though I have a completely normal weight and I'm healed I don't have it and I'm afraid I won't get it anymore I've told me a few times if we'd rather not go to the doctor even if I don't want to ... and she says it's not normal until fifteen. ..but I already had it before! What should I do?