Hi, i'm new here

i've had bulimia for 3 years now. I've never seeked any help because I didn't realize that bulimia is a dangerous disease. After reading some of the topics on this forum i'm scared for myself. I didn't realize that bulimia can kill you. I've tried stopping a few times but haven't been successful. I've lasted for a week max but then i've just gone back to my old ways. I don't throw up all the time, only when I eat junk food or when i've eaten too much. I throw up maybe 3 of 4 times a week, usually after dinner.
I'm not overweight but I think I am. No matter what people say I still think i'm overweight. I don't know how to stop. Over the last year or so i've noticed my hair thinning dramatically. I used to have really nice and thick hair but now my hair looks really thin. I've lost a lot of hair. I was just wondering if its anything to do with been bulimic. I don't see how because I only throw up a few times a week but i'm not sure. If it is to do with been bulimia how can I get my hair healthy again. I know the most obvious thing is to stop throwing up but that's going to take time.
Is there some sort of vitamins I should be taking. Please help because i'm really worried. Any advice will be greatly appreciated.