yes, I've worked with a therapist who specialized in eating disorders. I felt like I couldn't control my binge eating. Binge eating is a relative thing. You might want to post over in the binge eating area, I'd bet they'd give you great advice. This is just from my perspective. I'm not a psychologist or expert.
You've already lost 43 lbs, which is amazing, give yourself credit for that, even if you've backslid for 3 days (believe me, no matter how much you binged, you haven't gained that weight back!)
I worked on the approach of Overcoming Overeating, which worked for me. it involved (hold you hat) for me having plenty of whatever it was I wanted to eat around, and letting myself eat as much of it as I wanted, when I got low I'd buy more. this can be scary for someone who has weight and binging problems, but it turned around my binge eating.
it helped me get rid of that panic feeling that I had to "finish" eating something, that I'd run out, that there wouldn't be enough, that I'd be deprived. now I can eat one scoop of ice cream, or not have it altogether because I know that there are millions of gallons of ice cream out there I can have IF I WANT IT.
don't despair. lots of people deal with emotional eating, binge eating, overeating, a combination. yeah, sometimes it's just fun to eat and it tastes good, and it's social. it can feel depriving to have to feel like you're constantly having to keep your calories down, and not have what you think you want to eat.
I'm not saying it's all solved for me, I still have quite a few lbs to go to get to the point where I'd feel like I'm at a healthy weight. I do feel much more mentally healthy about the whole process, and finally am getting to the point where I feel like it's totally doable, which is very comforting for me.
good luck and