What Causes Upper Abdominal Discomfort And Bloating Along With Excessive Gas?

Hi Doctor, I am a 30 year old male and in reasonable health. About 4 months ago I started experiencing frequent indigestion, upper abdominal discomfort and slight nausea. I went to my doctor and had a physical done. They performed an abdominal ultrasound, CBC, and stool sample. All came back normal. My doctor prescribed me an antibiotic and omeprezole. The upper abdominal discomfort never completely went away. In the last week or so i have been experiencing a lot of excess gas and bloating. In the last few days i have been having very pale stool. I have scheduled a follow up with my doctor but the earliest appointment I could get is a month away. I am starting to get worried it could be very serious. If the gas, bloating and pale stool continue I am debating going to the ER. Any help would be appreciated. Thank you.