Since you asked — you know who you are — this is my report: After a week of not using my right thumb for trackpad-clicking (except in rare cases of reflexive gesture), not using it much for typing (using my left thumb or right index finger for the space bar), using a trackball set away from the TiBook, taking regular doses of Naproxen, and applying heat as much as convenient, my thumb feels a little different. That actually amounts to more than it suggests, since the times my thumb tended to hurt were specifically when I was using it, so if it feels better even when I’m not using it, something good may be presumed to be at work. (I think that makes sense.) The swelling in the tissue over the base of my thumb has gone down somewhat.
Taking Naproxen is tricky, since I’m not feeling a distinct ache that might remind me to take the pills. I’ve forgotten about them altogether once or twice, and several more times have taken them later than would be my plan.
The injury doesn’t feel like the descriptions of De Quervain’s tendonitis suggest; the Finkelstein test doesn’t feel bad at all. But if this makes my hand feel fine again, so be it. We’ll revisit the matter in another week.