Dear Doe-
I had headaches so severe that I begged my husband to shoot me. After doing a lot of reseach online I found them to be horomonal. I kept mentionaing this to my GP but he accused me of be an addict. Not only did I switch doctors, but I went to a vitamin store and pruchesed natural progesterone cream. Used as directed within three months my headaches were completely gone and I no longer need anything for "migranes". Like you, Immitrex and other migrane meds didn't work. But now I feel great. That may be something you would want to look into.
The cream is all natural "root a wild yam" put on twice daily and very inexpensive since 1 container lasted me three months for less than $20.00.
Just a thought especially if you are progesterone deficient.
Good Luck
Waitingfor1023