I discovered some things yesterday during my 80 mile ride:

I should NOT drink 12 oz of premium chocolate milk 35 miles into the ride.

I'm not sure if I'm lactose intolerant, but my stomach was wrenching in protest for the last 45 miles. Ugh!

Also, while I thought I had fueled pretty well thoughout the ride and before it, I felt really bad after the ride... kind of feverish, yucky feeling. I felt better a few hours later when I had a real meal (when my stomach could at last feel hungry enough to eat). Felt like my body was in shock from all that exercise. I wonder if that's the case?
During the ride I probably didn't drink enough water, 4 or so bottles total, over 6 hours.
I ate: 2 apple nutrigrain bars, 1 package of clif shot blocks, 2 bottles of gu2o, 1 half peanut butter nutella sandwich and 12 oz of chocolate milk. Two hours before the ride I had a massive bowl of Kashi oatmeal with maple syrup.

Do you suppose my body could have been in some kind of nutrition deficit shock? I drank tons of water after the ride, even though i didn't feel thirsty. I felt better by 6 or 7 pm.

Today I feel fine. Surprisingly good actually.