I don’t know if this is well known. Me myself, I just found out. My migraines start with a white flash in my eyes.
I take over-the-counter medicine as soon as I see the flash because I recognize the symptoms now. It doesn’t help nearly as much as an ice roller on the temple of my head or against my sinuses and eyes…but even better
Arnica Gel. So much that I decided to post as soon as I was able to. I applied it all over the side of my face and scalp that was hurting so for me it was my left side all the way to the top of my mid ear (under my hair) covering my forehead, brow bone, nose, and cheek. The change was noticeable and more pleasant. Not 100% cured but significant enough that I will carry this around in my bag at all times.
I also use it for my degenerative neck disease. My C5 C7. CBD cream can get expensive and this stuff works just as well! (Over magesium too).