Bootcamp Sequela?

Ever since we attended our first Bootcamp on Monday, I've been feeling a little bit off - but I can't quite put a finger on it.  It's just a general feeling of malaise, and it doesn't help that there's been thunderstorms in the afternoon for the last few days.  I really should be getting back to the gym, but with the downpour it's more likely that I'd stay in once I make it home tonight.