question: Hi, may I answer your health queries right now ?  Please type your query here...It is very difficult to describe my feeling; just like today I suddenly feel there is something stuck in the middle of my esphrogus and made me very difficult to breath.  I tried to cough in order to get some oxgen and then I drank some water and swallow it deliberately.  What is this?  Related to heart problem.  The occurrence is seldom, like several times in a year.  Thanks. Phyllis