What Causes Persistent Discomfort In Upper Abdomen After Eating Or Drinking?

Over the last 3 to 4 months, Ive had an increasing level of discomfort in the upper abdomen. It feels as though there s a balloon inflated. It is especially apparent after eating or drinking even small amounts of food. I m a very active individual. I am 5 9 and weigh 185. I m not overweight looking and I work out a few days a week. i don t smoke and do not drink a lot. I have seen my primary physician about this a couple months ago. He told me to try and treat it like indigestion with some over the counter stuff and gasX. That gave a minor relief but not significant or lasting. The condition seems to be getting worse. I have an appointment with a Gastro doc this Friday. However, I would appreciate knowing any potential questions he may ask so that over the next 6 days before the appointment I can monitor for any signs that may answer any questions. Thank you