It doesn't sound like you are suffering from a full-blown eating disorder yet, but you definitely seem to have some problems with stress, maybe depression, and it could become an eating disorder if you carry on eating like you have been, because you start to get obsessed. I started off skipping breakfast, having diet coke for lunch and only eating with my family in the evening. Three years later I was diagnosed with anorexia nervosa. It was absolutely horrific. I'm happy to say that I'm now recovered, but it never, ever leaves you.
Don't let yourself get to that point. Please, please, get some help.