Amlodipine
"I started having menstrual migraines monthly in my mid-thirties.  They had gotten to the point of lasting upwards of 18 hours with uncontrollable vomiting and moderate pain for a day or two before and after the migraine.  I  started taking Treximet and an anti-nausua medicine which did work when the migraine started but was still living my life around avoiding triggers.  I also developed mild hypertension during these years.  My dr. prescribed 2.5mg amlopine and the migraines decreased in intensity.  He upped dosage over time to control the hypertension and my migraine intensity decreased proportionally each time.  By the time I got to 10mg, the migraines were gone.  I still get a little headachy each month, but it's just that, a mild headache."