Hi PJess,The top of your stomach is swollen at this point, and your brain interprets that swelling as fullness. As the swelling goes down you'll be able to begin to eat more. You want to be careful not to overfill your stomach because it will put pressure on your sutures and cause you discomfort.
Don't worry...you stomach isn't all that much smaller...it's the swelling that's the culprit.
Happy healing!
Denise