I had the same problem with my hip this morning, though I know it was from overdoing it last night trying to get things ready for the exterminators.

I like the idea of cleaning toward one end of the room. It's a good idea for tackling the individual rooms. I've actually got myself on a "room a day" schedule. Bedroom on Monday, living room on Tuesday, dining room Wednesday, et cetera. It's the only way that I'm sure to get things done. But I have a tendency to miss things even with it so I may take a page from your book on that one.