ok i have stomach nausea and sometimes pain around the belly button and also under the left breast, using the bathroom relieves it sometimes, but i get bad heart burn, and it all started with one morning i woke up and got a real cold coke and as i swallowed it then it burnt n hurt the entire way down and sent a real sharp pain into my stomach, also my stool has become a real light brown, not clay grey or white. and a few hours after i eat something fatty i will have loose stool someone pelase tell me what this could be