When last night's improvements disappeared more and more all day long, I finally got my act together, stopped being "a guy", and went to see a doctor. Also, my mother called and told me to go. I went to an urgent care clinic in Waikiki, and it was the nicest "urgent care" place I've ever seen. It's just one doc, one nurse/receptionist, and that's it. I was in within 5 minutes.
My temp was a little under 103, so not shabby and that was probably low as I had taken some Tylenol about an hour earlier. He thought maybe the flu, but the culture came back negative. He then declared it was "a virus" and that I should come back on Friday if the fever didn't go down. In the meantime, take tylenol every 4 hours, drink fluids, and rest. So we're back to what I've been doing.