On short rides you really shouldn't need to eat during the ride (unless you didn't eat before you began) but you should be drinking. If you are getting dehydrated it could explain your feeling sick. If water isn't enough, try an energy drink. I never need more than just water but my husbands sweats so much and gets dehydrated easily so he drinks gatorade and water.

In our bike classes we teach "eat before you are hungry and drink before you are thirsty".