Too Much Distilled Vinegar.?

Well the other day I had some heartburn after eating a peanut er and jelly sandwich, so I took at least 4 teaspoons of Distilled Vinegar. Afterward I started burning, so I drunk water and milk and went to sleep. So the next day [Still burning] I went to the hospital and they said I have gastritis, so I been taking pepcid for my stomach as well as eating bananas and it's been three weeks now. My stomach isn't burning but my stomach and chest is irritating me. Can it be a ulcer or is it my body healing itself? [What can I do?]