I can relate to your problem...I've also lost 50 pounds and managed to keep it off but have recently felt a bit out of control with food myself.
I think when you're a person that has struggled with food issues (meaning having gained weight due to eating poorly or too much; not necessarily an eating disorder), during times of stress I think you tend to fall back into those habits that got you into trouble in the first place. No one is perfect - For me, starting a new career where I know essentially nothing (from a position I had a sense of mastery in), working longer hours with a longer commute, trying to keep my home (meals,laundry,shopping,cleaning,bills...) running as normal, handling my elderly mother's business affairs, and also doing my best to keep in touch with friends and family all while trying to maintain what has been a successful clean eating and work out schedule...well, I think I finally blew a gasket!
You've gone through a lot in a short period of time...even when you think you're "handling" it all, eventually something's gotta' give!
One thing that REALLY helped me was the book "You On a Diet" by Mehmet Oz. Once you can get past his corny and too frequent puns it's full of good information. Basically, he explains chemically what's happening in your body that makes it so difficult to control your cravings. You still have the work to do to get yourself back on course, but it took my feeling of being weak (failure, out of control) out of the mix.
So for me, now that I've been completely in the food red zone for the past week or so, I'm just going to have to bull my way through the next few days and then I'll be back on track. You can do this too...just take baby steps - meaning clean up just one or two things a day, if that's all that you can manage right now. Then next week, add an extra workout...get some more endorphins pumping through your system. You see where I'm going with this, right?
Be kind to yourself...what would you tell a friend in your shoes? Be your own friend and go on a walk with yourself...have a great conversation with yourself (in your head, of course
) and think about how fabulous you are (seriously!). Make yourself laugh...I'm amazed at how much I have to say when I'm on my elliptical (my conversations tend towards an audience of teenagers with their whole lives ahead of them, encouraging them to make good choices)
Remember, each time you make a good decision for yourself, or avoid making a bad one, is a step in the right direction.
You'll be okay...