I'm so sorry to read about all this from the OP as well as EnglishDave.

For both of you: for pain I use kratom. It's legal here in the US in all but I think 3 states and readily available from online vendors. Please PM me if you want more info. It's a natural substance, the leaves from a plant crushed and made into a powder. I would certainly recommend it over Vicodin or the other pharm opiods for pain and general well being. I cannot comment on any of the other meds for PN.

For Dave: I'm a clusterhead too, have been all my adult life but thankfully recently it's gone away, I hope for good but you never know. **You mention in your list of meds Topiramate. Very helpful for me although it puts me in a fog. Shall I assume you've tried oxygen therapy? It's a godsend. There's also a mega-vitamin regimen which has helped many people. Details on the forum. And please PM me if I can help.