WTF?

Ok,
How am I still hungry? I have eaten my sausage, 1 cheese stick, strawberries, and pizza topping (at different times, not all at once). I have drunk my tea. All I have left is my pudding and 1 cheese stick. How am I still hungry? And not slight tummy gurgling, but real pain in my stomach and sides. Maybe it's not hunger. But, what else could it be? Gas? (sorry, TMI?) Thirst? I am in the middle of drinking another 25 oz of water. That would make 45 oz of fluid so far today - hardly dehydration worthy.
I wish I could figure this out.
I went for a walk. It was shorter then I anticipated - only 15 min, but it was nice to get out. And since I have no teaching this week, I can plan on working out fully tonight.
I wish this pain would just go away. It's very distracting.