I am in the autumn of my years, so to speak. There is no doubt in my mind that I have an addictive personality, and I have GAD too. With many aspects of my life, it's an "all or nothing at all" situation. I am not overweight either, but at the beginning of last summer I decided to take off 5-10 pounds that I had put on while on Remeron, and do that by eating healthier and cutting out the sweets. Well, I love my sweets, and so I ended-up eating no sweets for a few weeks, and then I would binge on them, just like you mentioned. This went on through the summer, and I would get the "guilt" feeling too.
I finally came up with a very simple solution for myself, that being to not deny myself my sweets, but be sensible with them. Now I'll even have a cookie after breakfast, after a healthy breakfast. This seems to be working very well for me. I find that it also helps to buy bite size sweets. If I buy a bag of the bite size candy bars, one is just fine to kill my sweet tooth. But if I buy a full size candy bar, well I'm going to eat the whole thing in one sitting.
You might want to give this a try. The best to you, Q!... Chuck