Just 5 pounds

I weigh 635 pounds as of May 1, 2008. I've been to a binge eating program, an eating disorder clinic and am currently seeing a therapist and a psychiatrist. The best I've done in the last two years is maintain my weight. While this is better than my normal twenty or so pounds put on per year, I haven't actually lost weight. I don't know how or if I can do it. It has been proven that less than 10% of morbidly obese people are able to take the weight off and keep it off. The only way I can accomplish this is to concentrate on losing just five pounds. That is something I *know* I can do. Thinking beyond that makes me feel helpless and hopeless.