ok thanks a lot that makes me feel better!
It probably slipped down your esophagus and got stuck halfway or slowed down in the middle (might explain the pain) until you drank more water. Many antibiotics make your stomach feel like that, zithromax does that to me. I have done this myself a few times and it is uncomfortable. IF it landed in the lungs, you would have known it...people with normal gag reflexes and swallowing cough and sputter if even a little water goes down the wrong way, at least that is what I have observed in my years of pill giving as a nurse . A pill would have triggered explosive coughing if it got that far....or even choking!
I hope this helps..Sunny