In the same boat mate and not the first time! The first episode got really bad, I could hardly pick up a mug of tea, ended up with a hydrocortisone injection which did help in the end. 2nd was during our cottage renovation, the advice was to rest my arm and hand for 3 months. Obviously that was a no go so I just had to work through it. Recently It's flared up again, bloody agony at times.
Total rest seems to be the way forward, not easy when jobs need to be done and a crust to be earned. I have got an adjustable strap/brace that goes just below the elbow, it does seem to help me when I'm working.
Anti inflamatries such as Ibroprofen can help (don't like taking pills but needs must!) it's not a case of just taking them when it's bad, you need to take them regularly. I've got some from the Doc's on perscription and they have helped.
There are some exercise's the Physio gave me, can't really say they've helped but maybe in conjunction with the tablets it has? The other thing is an ice pack.
The plus side is apparently it's self limiting, as in it eventually gets better, in most cases, in around a year?
I'd go and see your local GP or Physio if you can and see what advice they give.