What Causes Pressure On The Throat And Adam's Apple?

Hi, I am a 28 year old male with no other health problems and a history of good health. I do not smoke. For about 4 months I have been having strange throat sensations - initially these were a feeling of something stuck in my throat. This feeling stopped and, for about the last month, I have just had a feeling of pressure on my adams apple and glands. As a result of these feelings (particularly when I initially felt something was stuck), I have often been coughing and aggresively clearing my throat, trying to cough up whatever it is that is stuck in my throat (which is probably nothing). The last couple of days, the feeling of something stuck in my throat has returned. Is it possible that I have damaged my epiglottis with all this coughing and that this is now what I am feeling. Is it possible for the epiglottis to not open again after swallowing (therfore blocking the airway itself)? Thank you for your time