Short ride today!

I had a doctors appointment today as was unable to eat as blood was going to be taken. I returned home and had breakfast and decided I would ride as soon as I was finished. I am not sure what happened, but I felt very weak and felt I shouldn't push it. I ended with 10.16 miles at an average speed of 14.1 mph and a top speed of 22.1 mph. I rode for 43 minutes and burnt 504 calories. The temperature was 84.9 degrees f. and the wind was from the East at 8 mph. This feeling never happened to me before and it was horrible feeling like this. I feel fine now, and guess it was the eating and riding within minutes.