You're story sounds so similar to mine. I started FitDay several months ago at the advice of a dietician, and absolutely loved it. I really started having great success, and was feeling awesome. I had to go away on business for a week, and even though I felt so great, I just couldn't get back on track once I got home.
I think most of my eating is emotional, stress, boredom, you name it. I almost feel like sometimes I am afraid to lose the weight because if I do, I won't have a crutch to fall back on anymore. Sounds ridiculous, but that's the only reason I can think of that I keep falling off the wagon.
All I can tell you is stick with it, and remember that the great feeling of success is all up to you. You just have to reach out and grab it...