Maybe someone will give this a try. Do you use the Pepcid as a preventive or to stop an attack that has already started?
Just as a historical perspective, I will mention that the antihistamine Benadryl has often been shown to be quite effective, and the overall D3 regimen is also an antihistamine method. Pepcid works on different histamine receptors than Benadryl (Pepcid, H2; Benadryl, H1), and it does seem (to me) that Benadryl might get more effectively to pain sources, since Pepcid works mostly on gastric/digestive tract receptors.
Regarding Tiger Balm, there has been discussion of it over the years, and several people have said that it gives them some pain "relief" by being unpleasant enough that it distracts them a bit from the CH pain. You can read input about this by putting "Tiger Balm" into the search bar that is at the top of any page.
In your 17 years of CH, I assume you have, as people often say, "tried everything." Are you not using oxygen, or the D3 regimen, or anything besides Pepcid, Tiger Balm, and turning your neck to manage your attacks?