I'm sorry to hear of your all too familiar pain. I have a compression fracture in my C7, as well as bulging L4 disk that has misaligned & fallen onto my L5-S1. I had a laminectomy outpatient surgery on my L5-S1 in December, 2016, and it completely relieved the pain in my left sciatic area and entire leg down to my toes. The surgeon took off the part of my disk that was impinging on my spinal cord. What a huge relief that continues to be. If you're wondering about taking the step to that kind of surgery, it was a godsend for me. I broke my coxsys about 20 years ago so I understand the kind of pain you have, only yours has continued for years.
My L4 is still a problem and had caused me chronic pain for 2 years. Rather than having major surgery involving rods and pins, my surgeon recommended that I try everything else to ease my pain first. After 2 rounds of PT, accupuncture, and different types of massage to no avail, I decided to try Active Release Technique (ART) , which I read about on Mayo Connect. I researched and found an excellent practitioner in my area. I was surprised to find that chiropractors are the ones who do this therapy because it is soft tissue very deep massage along with moving your leg, or whatever limb is involved. My first appointment the Dr Andrews told me to come twice a week for 3 weeks and then we would reevaluate. It was a bit expensive for an "experimental" treatment, but I couldn't even walk up steps or walk any distance without excruciating pain even with Tramadol 50 mg. Sleeping was the worst of all. So, I decided to try it. At the end of the 3 weeks (6 sessions) my pain was gone! I could hardly believe it. I continued to go every other week for about 2 months, and then once a month after that. I recently moved and while unpacking boxes I hurt my back again. I stepped up my sessions for 2 months and I'm back to no pain. It's been a year since I started the ART, and it has worked for me.
I'm a Volunteer Mentor with Mayo Connect and not a medical professional. I can't offer medical diagnosis or medical recommendations but I do offer my experience, knowledge and support. If there are any questions I can answer to support you in your search for relief, please ask them. I hope you find relief soon.