https://www.science.org/content/article/lsd-alleviates-suici...
I disagree, if it stopped it stopped. It could be from something else, but his LSD intake is the most likely candidate. It would become pseudoscience if he or she would claim that this will work for everyone.
Also, don't forget that science can make a similar flaw. Just because a drug works on average, doesn't mean that it will work for you or that it won't have any negative side effects. Human variation can be quite big with certain things.
In… all likelihood you do not?
This review paper is particularly interesting, especially because nobody is discussing this and nobody has read it: https://www.frontiersin.org/journals/immunology/articles/10....
The author is a serious person and this is a significant review paper of a solid and broad research foundation.
There are also studies on 5-HT2A agonists (“psychedelics”) on migraine and cluster headaches directly.
Also, it's common to have a lot of migraines for a period in your life and then stop having them. Or sometimes the reverse. I used to get very painful migraines about twice a year. Eventually that stopped. I still get migraines a couple times a year but they're quick "silent migraines" i.e. not painful, just annoying and disorienting.