Me at 7 AM: Well, I have a cough, and my head feels like powerful magnets are pulling it apart, but maybe it'll clear up when I get up and running.
Me at 2 PM: My head feels like weighs 50 lbs., and all of me is inflamed.
(The inflammation is discomfort from various joints and muscles; it is not anywhere near as bad as feeling like you are on fire. It's just bad enough that I can neither fall asleep nor get up.)
Well, at least I didn't try to go through a workday like this.