A. If an Xray has not been performed that would be the first thing to suggest as chronic regurgitation could be caused by a condition called "megaesophagus" which is an abnormal enlargement of the esophageal tube.
If he licks his lips it might be a case of chronic nausea causing vomiting and not regurgitations. In that case I would suspect pancreatic disease (EPI, pancreatitis) or IBD (inflammatory bowel disease). A specific blood test can be done for pancreatic problems.
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