One of my (many) doctors counseled me against alllowing my blood sugar to waver all over the place, saying that could be a trigger. She was BIG on healthy eating, and spacing eating out in small healthy meals with protein throughout the day. And tons of water. Are you following the migraine diet, or eating diet foods? Often diet and lowfat foods contain lots of hidden MSG under other names, which is a huge migraine trigger, so I wonder if that could be your problem.