To the original poster: I have acid reflux and there are times that water is my WORST trigger. I can't explain it. Sometimes it doesn't bother me and other times a few swallows will make me feel awful. Prior to be diagnosed and treated with reflux, nausea was my primary symptom and what got me sent to the doctor. I had no heartburn, nothing.
Even now, water will bother me worse than most beverages (coffee is actually the worst). I can drink sodas and feel fine but a glass of water will leave me feeling full, bloated, and sometimes sick to my stomach.