Thanks for this update, charles'. So glad that combo is working for you! Do you also have oxygen? Have you considered the D3 regimen?
It would take a very long time to answer this question about those three meds individually, let alone in combination (I don't recall anyone who has taken that specific combo and only those three, but it could have happened, I suppose). Leaving side effects aside for the sake of discussion (but they can be significant), each of them has had successes and disappointments for people reporting here. If you want to see more, you could use the search bar at the top right of each page. There are not a whole lot of entries about cyproheptadine (Periactin) and not a huge number about amitriptyline (Elavil), but Verapamil is a whole other topic. Lots of people have tried it, some with very good results (often at doses that are considerably higher than what is typically prescribed). The Periactin is an antihistamine, and in the last few years, thanks mostly to Batch, it has been recognized that allergic reactions (even without symptoms) can fire up CH. Like I say, really too complex to try to discuss all this here.
Have you talked to your doctor about this stop/start approach to taking the meds? I feel pretty confident that that is not really a good idea, at least with the Verapamil and probably also with the Elavil.