M.R.
It's actually called tenosynovitis. I developed it in my left wrist (I'm left-handed) after I had my daughter. Carrying around a baby carrier made it pretty bad. I ended up going to physical therapy for about 6 months for it. I had a steel reinforced brace; similar to the ones that you find at CVS, etc, but those are just fabric and plastic. I would suggest going to your doctor and see about getting a referral for a physical therapist. I haven't had any problems since, and I have since had another child, who is now two.