I have recently developed pain shooting up one side of my hand, It feels like a tendon or muscle related to my thumb and forefinger. Even picking things up and typing this causes me pain. If I feel the side of my hand closest to my thumb (the flesh in between the thumb and forefinger), I can feel tension. Sorry I didnt look at all the other posts, Im at work. Which is a music store, so demoing guitars and such is my job. Any advice would be welcome.