It's a new day (technically the same day; I only wrote the post about 13 hours ago), I'm well-rested, I've spent the day relaxing, and I'm in better spirits now. Watching what my wife and I recorded last night, it's almost a totally different video than I remember. Sometimes—and I should know this by now—the best thing to cure a case of nagging self-doubt is to walk away from whatever's causing it for a little while.
All's well again.