Another thing you might try is a different kind of fast. Fruit and veggie juice fasts will give you basically the same benefits, but maybe will alleviate the migraines. Why not visit the site I've posted below and check it out? God bless!
P.S. By the way, I am VERY sympathetic to the pain you've suffered as I just recently began getting migraines (they started about 2 years ago) and it's the worst experience I can think of - worse than natural childbirth (and I did THAT 3 times too!). I never knew what pain was until I had my first REALLY bad migraine - I just knew when I went to bed that night (at 6 p.m.) that I was gonna wake up dead!