I know that a problem may appear chronic, but there are what is known as acute exacerbations of chronic problems, ie, flare ups. In these cases, you have to treat the "chronic" problem as you would a new injury--RICE.
It is the contractions of the wrist and long finger flexors that are causing the problem. These muscles contract when you make a fist, flex your wrist AND they assist when you flex your elbow. You may have to take a few days off all exercise that involves resisted finger, wrist and elbow flexion, ice the area and stretch the muscles.
It is also very likely that since the problem has been going on for so long, you have scar tissue and adhesions that will need to be broken up via manual therapy. If you can, find a sports/ortho physical therapist or athletic trainer for treatment.
Good luck!
Maribeth