I agree with Pat. If your weight is going up, you are likely over-hydrated. You may also have eaten more than your stomach is comfortable with - most people can only tolerate on the order of 250-350 calories per hour - or perhaps you ended up with more fat/protein than you needed.

You may also have eaten too much for breakfast or too close to working out. The usual rule of thumb is not to eat anything major within two hours of working out.

All the stomach problems I used to have disappeared when I switched from food to using Accelerade.