I guess my poor-man's Google diagnosis was spot on. After a quick trip to the doctor, the numbness and weakness on the left side of my face has been confirmed as Bell's Palsy. It's stabilized over the past few days as mostly a minor annoyance- I've figured out how to keep my eye moist, and it seems to stay shut pretty well while I'm sleeping. The doctor says that most mild cases of Bell's go away within a matter of weeks, so I'm hoping for the best there.
The real bummer is that I can't play my horn in this condition, so I had to bow out of OSB for this concert series. Gives me a rare excuse to go listen from the audience, though. Saturday Feb 2, 7:30pm at Jackson Middle School in Portland.