My stomach bloats up to 5x the size after i eat or drink anything. what could be wrong? its also really painful. colonoscopy was normal.

Slow digestion: You may have a problem with your digestive system (stomach) working slower than normal (called gastroparesis) which causes food and liquids to sit in your stomach for longer periods of time. This might be the cause of your bloating and pain. See your gastroenterologist again, perhaps you need an endoscopy or other evaluation of your digestion. Eat and drink small amounts at a time.

Abnormal: Stomach obstructed and overfills! intestine fills with gas from digestion and air swallowing. If colon normal by scope, this is an upper GI issue and may need scope upper- egd.