i dont know much about tendinitus during pregnancy, but i do know a little bit about tendinitis in general as i have it in my shoulder pretty bad and my mum has it in her wrists and a few other places, my brother also has it in his wrists lol
its caused by repetitive motions and/or repeat injuries that involve over stretching or pulling tendons
the braces help a lot because they provide the support your tendons cant give anymore
also cortisone injections (the steroriod shot sillyakchick was talking about im assuming) is also really really helpful, it works near immediatly and it works really well
a short explination for tendonitis is (this is what i tell most people who ask about it) its like artheritis only in the tendons, its when the tendons start to break down...its very painful and irreversable (i guess exept in pregnancy) but there are ways to manage it
i hope you can make a little sence out of that and you can find something that makes you feel better
~alicia~