Perhaps you've already tried all this, but when I was your age, I also had several years of increasing back pain. Couldn't even sit in a desk chair on some days. Unfortunately, being single, I was sent to distant assignments by GE, and had to see doctors all over the world: Sydney, Los Angeles, San Juan...they all wanted to operate, but fortunately I'd left town before they could get out their scalpel. Finally it was a doctor and PT team at Mass General in Boston that helped my pain to stop entirely by:
- pointing out that as I got older, my troubled discs would naturally shrink, become tougher, and recede from the irritated tissues
- that the spine was not straight, but was a complex system
of 4 curves
- muscle spasms in the back were often caused because that portion of the spine was never allowed to properly align, and hence those muscles never rested
- ensuring the spine was properly aligned during the night was of primary importance
I came back to my room in Manhattan and looked at my hotel mattress: typically it was sway-backed, old and beaten down in the middle. So I moved to the floor, with only the mattress pad underneath. I slept on my stomach, and also inserted a small pillow under my hips, to establish the proper curvature of that all-important lumbar curve. And in the morning, I'd do a few wrestler's bridge
exercises, to continue to strengthen and align the lumbar curve.
Initially I was in even more pain. But over a several week period, the pain level diminished, I was able to walk normally. And even got back to my morning jogs along the East River. Eventually I returned to sleeping in my bed...but always added a big pillow under my hips to compensate for the inevitable worn mattresses. I just turned 75, and haven't had a serious back pain in over 40 years. Those spinal discs must be tough as cobs by now! Good luck!