Barrett's oesophagitis (Mucosa) is a complication of GERDS (gastro oesophageal reflex disorder.
Only a small percentage of people with GERDS develop Barrett's and only a small percentage of Barrett's develop cancer.
\\\has the Barretts been caused by the prescence of the acid, or by the vomitting? In other words, \\
It is mainly due to the acid, "slipping" back into the oesophagus damaging the lining of the oesophagus, but the part played by the vomiting is not clearly defined.
He should continue to reduce the production and effect of the stomach acid.
Google Barrett's oesophagitis for a more indepth account.