Yeah, its probably Cubital TS rather than Carpal if its your pinky and the outside of your ring finger, I've had a bit of bother with it and have to a bit careful how I sleep now – always used to have my hands up around my face to protect myself from my girlfriend ;o)
Anyway, I had 8 or 10 physio apppointments through work which helped a lot so they're a lot better now (my right was rarely any bother). Difficult to pin down exactly where the entrapment occurs though, could be anywhere from the shoulder to the wrist apparently, and without electrically stimulating the nerve to see where the blockage is even more so. I haven't had this done because I can kinda live with it the way it is now as its much better than it was. I just don't lean on my elbow any more, I need to do some weights or something though to build up my arms a bit though, apparently that should help too.
Basically, doesn't necessarily need an operation, go see a decent physio and tell your employer its affecting your work a bit..
Best of luck, Andy.