Hi folks. I've revived this thread in hopes that it will help someone.
On one of these migraine threads, someone (sorry, cant remember who, can't remember which thread) told us of a gadget that his family used to rinse out their sinuses, but it was then unobtainable in NZ.
Last Christmas Judy heard of a variant, bought it, used it, and hasn't had a migraine since, or even a cold. As she was getting a 4-day migraine every two weeks or so, you'll guess what a difference that made to her life, and mine too.
The apparatus is marketed by NeilMed Products, Inc, or NeilMed Pharmaceuticals, which I suspect is a US firm. It is called NeilMed's Sinus Rinse and comes as a squeeze bottle kit with a few satchets of powder and a comprehensive pamphlet. It cost NZ$10.   Peanuts.
Judy makes up her own mixture, it is only salt and bicarb in boiled water, and she uses it as casually as her toothbrush. 30 secs daily. Part of her routine. More often if she suspects the onset of a headache.
I suppose it will only help those sufferers whose migraines are triggered by sinus problems, but it must be worth a try for anyone.

Hope this helps.    Chris.