I got some of that also. It’s always my left hand. I’m a lefty but I also played guitar right handed. Jerked and yanked on wrenches with my left along with working on diesel trucks and using my hand as a hammer. Plus instrument and electricAl work. Short story long I have someGeneral Tendinopathy, and joint damage/deformities of the CMC joint in the thumb. They won’t do that repair because I lose more use of it But pain will be gone. I’ll take the pain over losing use. Not fusing my damn thumb Joints together