Allergy? Addiction? Or annoyance?

Maybe it's all three! I'm talking about sugar. It gives me migraines but I seem to still eat it and crave it. Yesterday I had an awful migraine today I feel the aftermath which feels like a hangover... So today I stayed away from sugar with no problems but what will tomorrow bring? I choose to focus on today I plan just for today to stay away from my devil in disguise. Do you have a food that's hard to stay away from but causes havoc? What do you do? I know once I stay away for a while it gets easier but I need to get there.