I visited my friendly neighbourhood doctor this morning. Yep - chest infection.
10 days of antibiotics + 10 more days of rest should have me ready to run (really slowly) in 2 weeks time.
I'm glad I went. It wasn't earth shattering news, since I already suspected...but it is good to be on the road to healing. I'm really glad I got that 34k in 2 weeks ago, now. But whoda thunk it'd be the last run I did before Florida? I just wish I wasn't running my goofy weekend with nearly a month off running leading up to it.