Saef you just described so vividly exactly what I go through as well. There is a difference between my overeating and my binges. In addition to what saef wrote about the "willed mindlessness" there is also for me, at times an additional childishly defiant quality to my binges. Thinking about it now, I would say that the defiant binges tend to be triggered either by overeating or as a result of having deprived myself due to some stupid diet or another. My desperate mindless binges tend to be triggered by a general feeling of things not being right in my life.
First time I have really put this into words.

)
I did this tonight at dinner. My bf took me to dinner to celebrate our anniversary. I had planned to eat over my calories today, as a one time thing. But as the meal went on I kept rationalizing and eating even more to the point that I am now uncomfortable and miserable. I'm feeling very angry with myself, on what should be a happy day.