I think this is due to Topamax....I have been taking it for four months and my stomach has not been the same since. I have lost 13 lbs. due to diahrea. I thought I had Giardia a parasite but the doctor thinks it may be the meds. So I am being weaned off the Topamax. For me I have cut out refined sugar and coffee all together and my migranes have been almost nil. I hope they stay that way once I am off the meds. I have had migraines since childhood and sugar has been a huge part of my diet. So cutting it out has been hard but I have done it. GOOD LUCK.