When I start typing I often feel like I am spoiling something when the vibe in the conversation has been good before I entered. I personally would recommend Verapamil to no one. I have been actively (daily) working in the online communities for 10 years now. I don't know anyone for whom verapamil would have worked for 10, there are few who can stay on it for 5 years. Even if the response stays there are cardiac problems, detectable or not detectable. I would say if you are in relatively good health and have not tried verapamil, please keep it that way. I was on 480mg almost for a decade, 720mg for years and in the end 960mg and almost 1200mg. I regret every pill of it. I too started getting relief on my cycles, especially night hits. For me it was Vitamin D I was taking alongside verapamil. But I am not this against it because of my personal experience but because I admin finnish patient community and there is nothing in patient experiences - especially in long term - that would look good for verapamil. And when high dose patients get problems it's too late.
Steroids (prednisolone) are more dangerous than verapamil. They abort the first few cycles and doctors have limits on the dosages you can get as tablets. When the highest dosage steroid course does not abort a cycle anymore, usually the steroids have altered your cluster headache to hell of a lot worse it was before them. At this point some get steroids as IV. Again, not against these either based on my own experience (though I have lots) but they create nothing but tragedy if you follow same set of patients for 10 years.
Oxygen, Anti-inflammatory regimen and busting are giving nothing but great results though, in long term, in our community.