Sounds more like you may be experiencing Tendenitist. I experienced the same feelings some years back. It got to the point where I couldn't open a door. Just didn't have any strength in my right arm. It can radiate down the arm to the hands. Doctor put me on ibuprofen and had me wear an arm brace designed for Tendenitist. I found the best arm brace to be one called an aircast. It put enough pressure on the large muscle in my forearm to reduce stress to it.
Another symptom associated with Tendenitist is a tenderness in near elbow.