I agree with kaplods: sugar leads to more hunger and it is absolutely everywhere, even if you don't keep it in your own house/dorm.
I'd probably set up a rule if I were you, not a difficult one, but one to break the cycle so that you can get rid of the constant hunger pangs - it'd probably be something like: "I can eat as much normal food without sugar as I need, but no sugar or desserts for today" (this would include simple carbs, white flour, etc as well)
I don't think you need to try to give up sugar forever, but it does seem like you need to get it out of your system for at least a few days.
I think a lot of the time, particularly in western culture, we underestimate our physical impulses and overestimate our self-discipline.
The physical impulse to eat more sugar can be overpowering, can make us feel like we are going insane when we don't eat it, and the impulse takes priority over all our other thoughts until we satisfy it. It is quite dreadful to try and overcome.

