I used to work in construction. Some 20 years ago during a massive concrete pour my elbow started to hurt. I continued working for several days accompanied by a big pail of cold water, and as the pain built I'd stop place my elbow in the pail 'till it stopped hurting and start work again, repeating all day. Big Mistake! Got the job done but I was then in serious pain and totally unable to use that arm for many months. I tried RICE, physio, needling, pain killers etc but had no real improvement.
I'd been a serious tennis player when younger and while in the UK met some players who told me of a doctor who was the Lawn Tennis Association's medical representative. He was reputed to be Wimbledon class tennis players' answer to the problem. I met with him, and, for a fee he gave me a jab (actually several all round the area) of cortesone (I've no idea if it was 'just' cortesone or other ingredients too).
For me it solved the problem, literally overnight. I have read many times that cortesone can also have negative effects, tendon weakening amongst others, but for me it was a godsend! I now know that however small a pain in my elbow means I stop doing whatever I was doing to cause it, and let it rest. No problem since. ;-) It isn't called 'tennis elbow' for no reason, so going to see your local tenis club, and asking their advice might point you at some real world solutions.
Good luck!