I had a back injury from a car accident in 1998. The pain in my lower back was almost unbearable, I refused to take narcotic medication in spite of the pain. A pain management doctor gave me 7 lidocaine injections in my lower back, it was life-changing. Pain will come back if I overdue it and can last all day, nothing as bad as it was.

I don't know if there's any similarities between injections and the infusions, but it does sound promising. You have my best wishes for a positive outcome.