Have you tried ice? I am sure you probably have, but if not...take a regular water bottle, fill most of the way with water, and keep it in the freezer. Migraines happen when blood rushes up the neck...so at the first aura signs, lay down on the floor on the back and put the frozen water bottle under the neck. You can use a towel or T-shirt to make it not too shocking.

This slows the blood enough that it is not rushing, and so reduces the migraine...

also Peppermint oil, rub a drop on the temples, and back of neck up near the base of the skull.

I have recipes for migraine tea, and an oil mixture...if you would like I can make a post on them for you...