It sounds like you are feeling quite alarmed about the discovery of your problem. I don't want to offer you empty promises or reassurances, trying to minimize your pain, because an eating disorder is a devastating illness. All I can tell you on the positive side is that there are people willing to help you deal with the problem. If you feel that you have an issue with food, maybe it's a recognition that your instincts want to trust and urge you to seek help before it becomes worse. Having a food obsession of any kind, *regardless* of your weight, is a very miserable way to live, especially in the long run.
Anyway, I just wanted to let you know that you are definitely not alone. Your mom may find it difficult to believe/accept, but for now, if you could share your concerns w/ your family doctor or another professional, you'll hopefully be pointed in the right direction. Good luck and hang in there!