I've got some sort of bug that's given me diarrhea, left me unable to focus on anything for more than a few minutes at a stretch, ruined my appetite, sapped my energy so all I want to do is lie down and sleep, and given me sore legs so I'm afraid I'll fall over going up or down stairs.
EDIT: Oh, and a resting pulse of about 110 bpm (down from 120 last night).