On my return from the vacation in South America I got sick and had upper respiratory infection. I took macrolide antibiotic for three weeks. I was weak but lately I am finding that when I exert or do something briskly, I feel uneasy at the bottom of food pipe. I am wondering what is it?
Dear I can understand your concern.  There are few possibilities for your problems this may be because of gastritis or gastroesophageal reflux in which excessive acid is formed in your stomach and some time get regurgitate in your food pipe and is common after use of antibiotics. Another possibility as you have mentioned it usually occur when you do something, indicates some pathology in heart and that need to be rule out. In my opinion you take antacids and keep watch over your symptoms. If this unease is progressing and is specifically related with exertion you must consult your physician for expert opinion. Hope this will help you.  If you have any other concerns please feel free to message me.  Thanks for contacting Chat Doctor.