I have been on various hypothyroid meds since age 4 and always have migraines during or before my cycles , which are often irregular as far as schedule and usually heavy. I have had tsh redone and dr. upped my dosage. He prescribed a barbituate, I never filled because I fear addiction. also, referred me to a female gyno who knew nothing of hormones[which is why he sent me to her in first place]. waste of time, but negative pap. At least something good came from that visit. lol Could my medication have caused my migraines, was I misdosed? I also get side effects such as unwanted chin, neck hair[no mustache], temp changes, severe and sudden mood swings. ugh! My cycles have become regular since the updose however.