I think wearing it keep the muscles being used from being overwhelmed, which helps prevent more pain. Most pharmacy's sell them in splints area. I usually wear mine 4-5 days. I oppose you get one and it helps you. Oh, the ones with the "air pillow" doesn't work as well as others to me. My favorite one is buy "BandIt" one word. You may find them online.
Brokenswan, I have been fighting tendinitis since I was a teenager. I've had it in my right foot and my right thumb. I wear custom wrist splints at night on my hands. I also have a stirrup brace for my ankle that has a gel insert that I can put in the freezer to help support my ankle and bring down swelling. I don't use that one frozen much though, as ice and I don't get along very well.
Yes, I wear custom braces on my hands and have for about twenty five years, They really help otherwise I do not think I could sleep. I get tendinitis very easily. Geez, it is getting crazy....I have so many of the problems you all have! I have a family here!!! Lol Bless you all.