I'm 5'2 and all belly as well. I get this feeling if i have over eaten and that isn't hard to do. My stomach must be so squished in there that there is barely any room for food. So my midwife has told me to eat 10 small meals per day. Sounds like a lot but they really are small portions otherwise i end up feeling like you've just described. I can barely eat a whole sandwich without feeling sick nowadays.