During a headache attack, blood vessels in the brain dilate,

Have you ever read Dick Quinn's "Left for dead"?

Well you don't need to read it if you haven't to understand this comment.

Basically, eating large amounts of chili will bring back the blood vessels to it's normal size and strengthen the walls, preventing the higher pressure. And that is what Quinn did to combat his heart disease and eventually make a beyond a full recovery from previous heart attacks and surgeries he had.

Maybe that can help you too during your cluster attacks?

I'm no medical expert though. So, Do dyor on it.

Cheers mate. Stay strong! Rooting for you.