If you are active on this forum, you're probably over the age of 50, and by now should have learned to listen to the messages that your body is sending you. I had a similar ride a few weeks ago. The commute home from work on my bike (8.5 miles) I was "out of sorts"....stopped and weighed in at the clinic and told the gal there that something was wrong. My stomach kind of ached, I didn't have any energy (Friday afternoon) generally felt kind of BLAH! Got home, had some supper, and a couple drinks, went to bed and didn't sleep well. Was tired and with flu symptoms all day Saturday, actually took a nap about 2pm on Saturday. Finally got feeling better on Sunday, must have been some kind of a 24 hour bug? It was tough riding home feeling that way, but it was only 8.5 miles and I knew that I could gut it out. Yeah, I've called off a ride a mile or two in, for similar reasons, and gone home. Listen to the signals your body is sending and you'll feel better. None of us is 25 anymore....
Tractor Tom in Okeechobee, FL