Can't get back on track... :(

I started over on January 11th and on April 4th I was down 15lbs. I did have a couple setbacks, Valentines weekend turned into a week and a half of binging and I ended up gaining 7lbs. Got back on track on Feb 23rd and was doing great until Easter weekend hit. I totally lost control and haven't been able to get back on track. When I weighed in last Saturday I was up 4.2. I'm just feeling lost right now. I am an emotional eater. I like to eat when I'm stressed, sad, tired, mad, annoyed, you name it. I also have a bad back and knee issues from overtraining for a half marathon last year. Everything has been sore lately and that effects me being able to exercise. I want to be active but I have limitations and I miss running very much. Just feeling down in the dumps and stuck in a rut. Everyday I wake up saying today is a new day, clean slate, and then I end up blowing it, usually at the very end of the day. I was starting to feel good, I had gone down a size and I just blew it, again. Sorry for the long rant. If anyone takes the time to read this I would appreciate any advice although deep down I know what I have to do it's just the DOING it that I'm having a hard time with.