First, thanks to everyone for the kind comments and good wishes. DDad went home yesterday. They did send him home with oxygen and an appointment with a cardiologist, but so much better than what we were looking at earlier in the week. Not what he was planning for this week, but so glad he didn't decide to make the drive here. It's bad enough having things like this happen but I can't imagine how much worse it would feel if you were hundreds of miles away from home.
My before and afters (these should be clickable):