I have recently had a a stiffness in the little finger of my left hand and the left elbow seems to be stiffening up at times. I only practice for two hours a day, so it shouldn't be an RSI injury. Is it likely to be a result of recently attempting a piece beyond my modest ability or am I more likely just to have bumped the hand somewhere and not noticed it? The litle bump on my wrist seems to have swollen - though it isn't painful. What advice can you guitarists give me?