Update:
DH is fine, at home, and currently driving me crazy with his piano practicing.
Random atrial fibrulation (sp?) which, with massive quatities of meds (gratitude: meds), corrected itself after about 5 hours. Leaving DH very fidgety, hungry, and concerned about all the stuff he needed to get done for his business which he obviously didn't get to. When he started asking for a pen & paper to write his to do list for tomorrow and to brainstorm, I knew he was all better.
Oh, and what happens when you put a musician in an ER room, with nothing to do, but hooked up to a machine that beeps if you do a particular thing? (The machine that goes, "PING!") Answer: You end up with said musician finding new and interesting ways to make the machine beep in various rhythms.:doh: