I recently talked with my PM doc about having nerve blocks and he said that where they need to put them in right where I had my decompression surgery and that the amount he would need to put in would cause me to stop breathing. I would get a second opinion before getting any kind of shot.
I know that everyone is different with their symptoms, but I would not change the fact that I had the decompression. It has improved my quality of life tremendously. There is quite a bit of recovery time involved, so you would need to be prepared for that.
I have chronic pain as a "loving reminder" that I had some problems before the surgery, but in 2 weeks I am getting a neurostimulator to help with that.
Good Luck with whatever you decide.