Hi Pix,
I don't know whether those drugs hinder our condition or not so maybe I shouldn't be answering you but I'm chiming in because while I was staying in a nursing home they gave me Oxycodone and it helped rather well probably because it dulls the pain.
Being an opiate it works differently than the non-opiate cocktail I take now. (I chose not to go the narco route.)
This is what I was told by my neurologist. Opiates dull the system to were we don't notice the pain and what I'm taking, Gabapentin, Cymbalta and Amitrptyline dull the sympathic nerves at where they signal the brain.
Since the cocktail does rather well I'm sticking to it.
Maybe this will help, maybe not. Oh well, be safe and good luck...