Just to confuse things Sue, I was reading recently that for tennis elbow (I think, though it might have been golfers elbow, and different tendon) that if you were going to rest it, you actually needed to rest the wrist rather than elbow, because it was use of the muscle from the wrist that stretched the tendon and caused problems at the elbow.

My thoracic spine is now also going out in sympathy, and I'm feeling things I shouldn't be around my shoulder as well. Am going to have to really not lift anything, and not stretch out that arm to pick up anything (stretching OK, stretching and picking up is instant pain).