I've used two methods to treat my golfer's elbow with quite a bit of success. To begin with, you will obviously need to stop or significantly cut back on the activity or movement that initially caused it. However, to achieve full recovery and prevent it from happening again, you will likely require a physical therapy program. (Some people advocate deep tissue massage at the tendon-bone interface for golfer's and tennis elbow, and a search on the board found that some here got relief from that--I didn't. I also worry about aggravating the nerve adjacent to that massage site, as well as achieving symptom relief without rehabbing the muscles to prevent it from happening again). I have no financial incentive from either therapist or device.
This first method uses a Flextend, which is a glove with resistance bands attached. It looks like a medieval bondage device, but it works well. It also strengthens the fingers and helps prevent some of the injuries we are susceptible to. It has reported success with trigger finger as well. The massage in this method is along the muscle bellies further up the forearm.
Tennis elbow (outer elbow tendonitis): https://www.youtube.com/watch?v=AVhlgBDy_F8
Golfer's elbow (inner elbow tendonitis): https://www.youtube.com/watch?v=qV1ecwo ... e=youtu.be
The second method, which worked slightly better for me, uses a Theraband, which is a simple cylindrical device that allows for various types of wrist movement to work on various muscle groups. This therapist also recommends The Stick for the massage portion, however I found that using the Theraband itself to roll the muscle bellies worked just as well.
Both of these therapists advise against stretching, as it can aggravate the injury and you may end up back where you started.
I hope this information is able to help some of you suffering from these surprisingly debilitating conditions. Other conditions of the wrist and hand can also be addressed with similar therapy techniques.