If your headaches are close to menstrual cycle and don't you think there is a correlation with hormonal activity? What does your OBGYN or Neuro says about it? Although I can not have first hand experience of what you are experiencing, I did not come across any solution for hormonal migraines (but I could have missed it too).
I would actually like to dig deeper in your NSAID allergy, like symptoms, if any medical professional told you etc., because in my case, NSAID is the ONLY thing that aborts my migraine. I also have Ulcerative colitis (if you know what it is). Within 4 hours of conventional NSAIDs, I bleed profusely (back end, of course) and my next 6 month are almost equal to hell. When picking my PCP's brain in Jan. this year, he Rxed me newer NSAID, Nabumetone, and life has been darn good since then..
Diagnosed March 2007 with left sided UC at the age of 30.
Colazal 9 daily, Imuran, 200mg daily, Vit. B12, 1mg, Multivitamin, 1 tablet daily, Fish oil 2400mg daily, Vit D 2000 IU daily.
Verapamil 320mg for migraine, Migraine episode now at least 4X a month,
Nabumetone 750mg as an abortive, so far so good with GI side effects.