I have had it for years. I take a anti inflamitory like advil or just plain old asprin. I get some relief. I agrivate it when I am doing alot of sewing. I discovered that its the ironing that really makes it flare up . My iron is heavy and the motion of lifting it bends my wrist back , and the weight causes the tendons to be streched and inflamed. I lowered my ironing board and it helped a bit.
Now I use a light weight iron when doing marithon sewing sessions and it really has helped alot. I also take the asprin prior to doing the sewing( at the recommendation of my Doctor). this also helps. I use ice packs after a long session as well.
So far I have been able to avoid surgery, but there were times when I would have cut off my own hand and arm it hurt so bad.
Try the anti inflamitories and ice , it really really helps. If you have a paricularly accute case (as I have ) , I had to stop just about everything for about a month. Then did some rehab , now I can tell if I am "pushing it". and either stop and/or ice immediatley.
The spring gardening is also a culprit.