Please see my information. I went through exactly what you have for forty years. I no longer have problems due to a tiny little implanted computer. Pre-program electrodes send messages to my brain whenever pain begins. As you may know, the brain is REALLY what lets you know you are hurting. Must go to a reputable Pain Managment Specialist. They will insist you have a psychological exam to make sure you understand this procedure. It has saved my life, my career, and I can do most anything - including riding a camel across the Egyptian desert. I can stand for long periods, bend over without pain, participate in sports, and sitting and sleeping without problems. My pain is 95% gone - I actually was put on disability before I had this procedure done. I had similar symptoms as yours, and additionally discovered the piriformis muscle also interfered. Hope this is helpful.
BLM