The topic is actually vasculitis, but I did not find a way to address that directly. Please share. I had a headache behind my head due to an ethylene oxide intoxication, which caused blood vessel inflammation (EO crosses the blood-brain barrier, and one of the causes of back-head pain is blood vessel inflammation in the brain).
I took GE-132, i.e., organic germanium supplement, and the damage went. Why? Germanium, this little-known thing, boosts oxygen throughout the body, apart from being beneficial in and of itself also for the brain, so my brain blood vessels were nourished and repaired. That's how I can explain my sudden improvement.
Caveat: be careful about the kind of germanium supplement.