FWIW, two relatively recent posters from somewhat nearby countries have been Milelli from Germany and Siegfried from Belgium. Siegfried actually has a hemicrania, not CH, but he has done a lot of CH investigation.
Denny, is the Facebook group more international?
As I remember, there is (or recently was) an LSD study in Basel. I don't remember whether it was specifically for CH, or perhaps for something else, like anxiety.
(If there was a selection here to rate this post as "almost completely unhelpful despite good intentions," it could get overwhelming support, I think.)