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Definitely get a wrist brace, they will support your tendons and make a world of difference. I like these ones.
Also it's worth doing some exercises every day. I get tennis elbow and other tendon problems now and again and use a Theraband flexbar. There's a flexbar exercise called the Tyler Twist which is good for the tendons. The bar comes with a booklet showing a lot of exercises you can do with it.
Finally, consider taking astaxanthin every day. It's an antioxident with anti-inflammatory properties which really helps with tendon problems. You might also get some good results by taking a turmeric supplement (or adding it liberally to your food).