A few months ago I experienced an issue while eating lunch. I was eating chicken and started to hiccup. Then it felt like I had an extreme case of heartburn. I was throwing up anything after that to include my saliva. I went to the emergency room and I had food lodged in my esophagus that had to be removed. Since that incident it has occurred two more times but I was able to get it down on my own. What could be causing this?