@darrenm I concur with @user_che214927 Barry's opinion to seek a different neurologist. I think doctors are not all the same and it's good to get a fresh opinion. I also don't understand your doctor's reasoning for going back on Lyrica for a month since you already saw no benefit from it before. What was his reasoning? Finally, I would really suggest you look into any new ways of determining that you truly have sfpn because of the unusual way your pain manifests. There is the skin punch biopsy option. Here is an interesting article about that:
https://www.hopkinsmedicine.org/news/articles/delivering-a-one-two-punch-for-peripheral-neuropathies
At the risk of getting a little too arcane, there is also something that @rwinney has mentioned called confocal microscopy which supposedly can tell you whether you have sfpn. The equipment is not common, mostly at research centers and universities. I mention it just for the sake of completeness. Okay, that's it for my thoughts of the day Darren. I mainly wanted to add my second to Barry's suggestion about thinking about trying a new neurology doctor.

Good luck my friend. Hank