I recommend this book as a supplement to what you are already doing.
[ame=http://www.amazon.com/Overcoming-Overeating-Jane-R-Hirschmann/dp/0449003825]Amazon.com: Overcoming Overeating: Jane R. Hirschmann, Carol H. Munter: Books[/ame]
And if your therapist doesn't specialize in eating disorders, I would try to find one that does.
I know how hard this is. I still struggle with it after all this time.