The caffeine in the coffee stimulates gastric motility. Gas already in the stomach may be squeezed into the esophagus and regurgitated — so you burp.
If you have residual gas after a night of no solid or liquid intake, I am concerned.
Click
here to go to a web site that explains more.
That page does not address my greatest concern for you at your age: diabetic autonomic neuropathy.
Best to see a physician for a hands-on evaluation.
I'm here if you have more questions.
Doctor Nash
What I tell you is what I teach. I'm here to help improve your quality of life, and I'll work with you as long as necessary to help you.