I had chronic back pain for the past 40 years and I controlled it with a TENS and very powerful drugs. About 7 years ago, I tried pulsed radio frequency treatment for my back. It took my pain level to a 2 from a 10 (Scale 1 to 10, with 10 you wish you could die). I had treatment on S1, S2, S3, L4, L5 and L2.on my lower back. First it lasted a year for about 6 years. The last two years it lasted 6 months. I am not medically inclined, but it was like a miracle. I don’t know if this will help you, but it is worth a try if a pain doctor who performs this type treatment thinks that it may help you. You are in my prayers.