My wrist has been hurting so i switched to a racket and string that is more accomodating to injury. however it has spread to my elbow. in addition it spread to my forearm. The elbow and forearm have really started hurting today while giving a lesson to a student while hitting very lightly. I had to stop hitting and it was throbbing in pain for over an hour. Can anyone give some advice to expedite health or prevent injury from getting worse etc?