Oh boy MAB! Did you realize you would be going so hard and fast when you volunteered to do this thing? Wish I had some exercises for you for the wrist issue. Since it is a nerve thing, there really aren't many if any, meds you can use. Just make sure you keep your hand in a wrist guard as much as possible I guess. I also have carpal tunnel, but not nearly as bad as you're describing. BUT remember, your career isn't over! Aren't you still the lead singer for the brass band? And the wrist won't stop writing new songs. I suspect once you get back home, and go back to your normal writing, performing schedule, your wrist will calm down and you'll be fine.
Enjoy yourself up there!! Come home, rest a little, and get ready for your birthday bash! That will be great also! I mean, OD, the kid, and I will be there!
phil g.