Talk to Gastroenterologist on Stomach Issue

I had on and off diarrhoea for two to three days in the past week, along with that I couldn't eat any food because my stomach is upset . Since then my stomach remains upset and whatever I eat ( I mostly consume food in lesser amounts) I get abdominal cramps following one hour after eating food, and have loose stools once or twice a day. It's so disturbing as I feel flatulence in the morning and also feel full even after drinking a glass of water , It feels like my abdomen is so full even without eating or drinking anything. I've tried antacids and risek but couldn't get relief. There is feeling of heaviness in the upper abdomen especially in RUQ .