Bulimia questions. This is kind of important , please help.?

I used to be bulimic, and i'd say it ended around 3 months ago. maybe more. It went on for about 2 months, and now I'm getting worried. I do still have trouble eating right, and I haven't had my period in a long time. Is it possible that the stomach acid damaged my thyroid gland? if so, can I mend it without medication? I'm 13, and I'd like to just get over it and not involve anybody else. I'm scared. Please help. Thanks.