Just as the title states. It's pretty frustrating. I had severe lower back pain for about 2 years, around October of last year I started playing the bass guitar (played standard guitar for over 10 years with no problems). I strained my hand after about 2 weeks of playing my bass and it never fully healed. Around this time I was accepting my back pain as TMS and while it's not 100% gone, I'd say my pain level dropped at least 80%, I can do most anything I could do before, in fact I'm weight lifting with no issues. My back got better, my hand got worse peaking in late November with so much pain I couldn't play for even just 5 minutes! I started to accept this as TMS and I followed Sarnos advice and didn't stop playing guitar and the symptoms diminished for a bit but have sense returned. Seeking some advice from folks who have had a similar waxing and waning of symptoms. There is a discernable location for my hand/arm pain, its right below the hand on palm side, just on the wrist, pressing down into this area causes a lot of pain when it flares up nice and good. My back was extremely similar as there was a pinpoint location where the pain was concentrated and the pain radiated outward to my entire lower back with spasms and shooting pain down my legs/butt. My hand/arm is similar, although it radiates from the center of my wrist into my hand and into my forearm.