Have you consulted with a spine surgeon recently? Or a physiatrist? If not, you may want to consider doing so.
It may be that there is surgery or other interventions they can offer, as well .
I forgot to add. I also suffer from nerve damage. From my right buttocks to the right front thigh I have a tingling, electrical current sensation, numbness all the time. On my left front thigh I have a jabbing, hot poker type sensation, and numbness all the time. Also horrible muscle spasms in both of my calves which I take Tizanadine for that.