Melody, I receive lidocaine infusions for 90 mins every 6-8 weeks, they go some way to improving my quality of life. I always get immediate relief and then that night the pain increases for 24 hrs and then a noticeable improvement creeps up on me. This improvement lasts 4-5 weeks and then I am likes a battery winding down until the next time.
This treatment isn't offered routinely in the US but is quite popular in the UK now.