I had a similar experience after an L3/L4 decompression a few years ago. I know you probably don’t want to hear this, but I still have that nerve pain which I did not have before my surgery. I’ve had many tests, MRI, EMG, etc. but nobody has found the cause for the new nerve pain. I had L5/S1 fusion and decompression surgeries after the nerve pain occurred, but the surgeries had no effect good or bad. I know this is not helpful, but just wanted to share that I had this similar experience. Now I live with the new nerve pain.