So I have been unable to play significantly for a few weeks now as a result of my left hand. The simple act of playing, no matter how "correct" my hand angle nor how light the strings/low the action causes the tendons on the back of my hand (particularly in the pinky and ring finger) to ache. I've been spending a lot of time typing these past few weeks (pretty much constant writing at work) and I'm thinking that's got a lot to do with it.
It appears that the part of my left hand that corresponds to my third and fourth fingers seems to want to pull inwards towards my thumb, and the tendons and muscles on that side seem to be lacking the strength they used to have in keeping my hand level. When I pull them back to where they should be with my other hand, the aching goes away.
Do any of you have any exercises or stretching recommendations to help me gradually stretch out and rebuild the muscle memory and ergonomic shape of my hand? I've dealt with tendonitis before, as well as a similar issue cropping up in my pinky, but I've never had it affect my ring finger as well, and I'm interested to see what you think.