Yes Had Scope Down Back Of Throat To Have My

yes had scope down back of throat to have my heart checked, since I had that done, all I do is constantly have to keep clearing my throat. why drs ran some test but said I was fine,so why do I keep doing this, it is very irritating and annoying. what could be causing this, and who would I beable to see about this problem. thank you
my email is YYYY@YYYY