stop eating so much

I’m a good size, 5’8”, normally 140 lbs, but whenever I happen to eat a lot for a few days, I’ll end up gaining 5+ lbs in those next days and it goes straight to my stomach.. I’m fine everywhere else.. my thighs get a little bigger but besides that I want to loose the chunky stomach! Sometimes I just can’t help myself because there is so many different foods that are so yummy to me (pizza, rolls, big sandwiches, pies, chips, greasy fries and burgers..)