I had the same trouble and it was from fishing specifically the hook set arm. I commercial fished around 180 days last year so I set the hook on a lot of fish. I got an elbow sleeve and that gave me some relief but then got the Velcro wrap with a small pressure raised section. Put that raised on the tendon and strap it up. It gave me almost instant relief. I often wear the sleeve and the wrap especially when fishing.
