Ok, this is what I'm going to college for... at least part of what I'm throwing a hella lotta money at.
OT: occupational therapy. Keep in mind that I don't have a license, and if I did, I wouldn't try to diagnose a person over the internet.
Do you have any pain or tingling in your hand/s at
night?
Other than that, be sure you do Phalen's maneuver and check for Tinel's sign, both of which are linked to the Wiki page that Baltar provided.
If you choose to buy a brace until you can see a doctor, be sure you buy one which immobilizes the wrist in a neutral (0-degree flexion, 0-degree extenstion of the wrist) position to a 10-degree extension. Do NOT get a brace that jacks the wrist up in full extension. The studies that started that trend are out-dated and have been debunked.
And Balthar,
Comparisons between pre-computer typing on manual typewriters and current typing on computers suggests that mouse-use may be the hidden culprit. There is little difference, ergonomically, between old typewriters and new, but the addition of the mouse has come with a boom in CTS. (Although, perhaps we are just diagnosing CTS more now because typing for long hours is now a common practice in the US. It used to be just be "secretarial" work, but is now child's play.) Just an FYI; thought you might be interested.