Wow. I could have written your post word for word myself. It's horrible...the bingeing...isn't it?
Anyways, I'm almost positive that what your problem is is that your body is HUNGRY! I know first hand how addicting and "important" the weight loss can become...but if you are dieting too severely, your body becomes so hungry that it FORCES you to eat, whether you want to or not. I'll bet that if you told me what you eat everyday, I'd find that you are eating too little.
From an experienced point of view, please listen to me when I say that you. need. to. stop. restricting. your. food. intake. so. severely. (I know, easier said than done, right? >.<) But I used to be anorexic, but my body became so hungry that it forced me to eat, triggering a binge stage that even a YEAR after it started, it hasn't stopped. I've gained weight and I'm miserable.
Please, please, PLEASE try to do whatever you can to get this under control before it gets out of control. Have you considered seeing a therapist?
Well, I look forward to your reply and wish you the best of luck...