at the height of my fd, i did have a persistent pain in my shoulder that must have been caused by unnecessary tension while playing. before all of that, i had a bout of tendonitis that gave me constant tension in my wrist, but probably not like what you have. people do seem to have peculiar symptoms with this though that aren't shared by the majority. whatever it is, if i were you, i'd work on relaxing that tension away from your instrument for a while before trying to retrain with your instrument. i did this with my shoulder by concentrating on the good shoulder and trying to make the other one feel the same by relaxing it. a lot harder to do than it sounds. best wishes to you jake,
dave