Welcome to the CP forum! I am not sure about what is going on with you. I had the R/F done which from my understanding is the same as your procedure just a different name lol. I had mine done at L5-S1 and did really well for about a year. Of course these procedures are just temporary fixes not permanent. It took care of about 75% of my pain on the left side which was a relief. I had two levels done on my neck and had excellent results.
I think I would call my drs office and maybe talk to the nurse or a PA and see what they think is going on. It may be something totally differently. I just don't know what to think may be causing you this problem.
Again welcome aboard and I hope you will come and hangout with us.