In all my years with RSD I never had a lower block either. The risk always seemed too high.
My pain management doc wanted me to have a coddle epidural which goes under the lumbar bone. A Chinese orthopedic not licensed in this country said don't do it. He escaped from myo say tung regime.

However, had to get an orthopedic surgeon involved, and he actually wants to do surgery on huge bulging disc in my neck and has referred me to the pain clinic for this facet injection. Since I can hardly walk, I have made a new patient appointment at the pain clinic. ( that is how long I have been to any of these pain doc's)
If RSD wasn't an issue, I would go get a procedure done... But RSD is an issue..