Thank you for all of your responses! I am wonderning if maybe I had some heat some dehydration issues. I probably did not drink enough water the day before the ride. We started at about 9:15 and it was humid. One thing I did forget to mention was that it was very, very breezy. I will also definitely try the Nuun tablets in my water bottles and still have my Camelbak with water. I still learning what to hydrate and nurish for these rides. I also read somewhere that pretzels are a good cycling snack. Had not heard that before but I'm liking it!