The bottom of esophagus hurts, almost feeling as if my sternum is bruised. It ranges from a dull ache, to burning. It goes away whenever I drink water, however returns almost immediately after. It feels fine when I am moving around/standing, however sitting and laying down it seems to occur more often. I have been belching more often, and have had diarrhea for the past few days. I have been coughing as well. Sometimes I find I lose my breath, but at this same time its me noticing the pain and become worried/anxious and panicking slightly about what is happening to my chest.