I had a discography and nucleoplasty done in 2010, I will not lie, it hurt like hell, the whole procedure is done without pain relief whilst you are awake as they need "feedback" whilst they do it, they whack a ruddy great needle into the disc (literally), so they can inject a die take xrays and then send something else down it so radio waves to break down some of the disc, only when they are about to remove the needle do they give you some numbing stuff and pian killer.
I was at the time happy they could not get access to the lower disc.
I was then laid up for about 3 days.
The only advise I can give you, is make a nuisance of yourself with the doc, ask to get to the pain clinic (if you have not been already)
I am hoping now that being a pian in the backside, I will get something done, I have spent far too long being layed back and taking it at the NHS (No Hope Service) pace.