Not sure what's going on with me right now. Since getting back from the cruise, I've been alternating, nearly every other day, between feeling pretty good and energetic (even with the cold), and feeling limp and foggy and "off". Today is one of the latter days. I tried eating lunch, thinking I might be hungry, and because dinner helped immensely on Monday. I'm reacting to the flour coating McDonalds' fries at the moment, but didn't get much of a bump from "#4" (double quarter pounder meal, no bun) otherwise.
I took some aspirin as well, after eating. It may have helped a little, but my overwhelming urge right now is to face-plant into something horizontal and sleep the afternoon away.