I know how you feel. I used to be the same. It is sooo frustrating. It was so horrible buying say, a chocolate bar to last all week and then finishing it one evening...

I found that for me, it was emotional eating, hence food charts, diets, etc didn't work because it wasn't about the food, it was about (please excuse the cliche) - "filling the void". When I thought about it, I realised that I was unhappy with my relationship, I hated my job and was generally unsatisfied with my life, and rather than dealing with that would look for something pleasant to do, e.g. eat chocolate.

Sweets and junk food stimulate the same parts of the brain as alcohol, cigarettes and other drugs, which is why heaps of people overindulge in them. So I recommend that you look at why you eat when you're not hungry. I'm not sure of what your personal situation is, but is there something about it that is bugging you? E.g. are you working? If so, are you happy with your job? If you're not, do you want to? Do you want to pursue a hobby but don't because you fear failure or ridicule? How are things with your family and friends? I think that if you realise what it is that you are not facing by eating instead, then you can stop overeating for good.

HTH. Good luck.