..I haven't read this whole thread but I believe I have the gist of what is being recommended. Having endured 4 years of hell battling TE, I must say that the "elbows of steel" recommendations border on irresponsible.
If your elbow is hurting, do NOT head to the gym, the court, or even take ibuprofen or use ice. ...Let the body deal with the injury! Allow it to heal!!! ..Once the pain has totally subsided, resume tennis and working out. However, to avoid recurrance, I'd suggest working your way back up to your previous workload - both in terms of frequency of tennis (or working out) and in terms of time spent on the court (or reps/weight).