I think I have something similar to what you're experiencing, topsl, from overcompensating on my strokes due to my shoulder impingement issues. Heat beforehand seemed to relax it a bit, NSAIDs had 'some' improvement.
The biggest pain reliever I encountered was actually wearing a tennis elbow strap across the forearm muscle of my right arm. I wore it a few inches further down the arm towards my wrist - oriented so the little gel pad (of the strap) was snug against my inner forearm muscle.
I'm not positive my problem is exactly the same as yours. But, it sounds somewhat similar. I experience a good bit of pain in the elbow/forearm area from squeezing or twisting. I've been off of tennis for a couple months now and it has improved but will flare up a bit while doing my shoulder exercises. I'm guessing it takes time to completely disappear...
Off subject, I grew up in Fort Walton Beach and actually played a few tournaments at Topsl. Good luck!