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It is reassuring that you had a normal upper GI.
Burping comes for excessive air in the bowel from either taking in air with eating or drinking or from food sitting too long in the bowel and forms a gas.
So, if your GI studies are normal you can increase the fiber in your diet to help regulate your stools by using Metamucil or something similar on a daily basis.
Also probiotics are very helpful in restoring gut health.