Well, I feel a little less freaked out now.

First, yesterday afternoon I ran into my neighbor, who is an osteopathic doctor, down at the mailbox... (we share a private road) and told her what had happened. She put me through a couple paces and felt around. Says she doesn't think I've torn anything that will require immediate attention, but I should take it light for a while.
Then I had a couple hours practice with the band last night, and though it ached a little bit on the way home, I feel pretty good today. Maybe, maybe, maybe...
*I'll tell her you said so, Darrell.

(only drummer I'm gigging with these days is a very petite 95 lbs, and plays a Cajon'... a nice wooden, one-trip-to-the-car set.)