I'm experiencing this chest heaviness and heavy breathing whenever I walk or do any small physical activities, and it's been going on for about three weeks now. I already went to my GP about two weeks ago and was on Azithromycin for three days, but it didnt really help. Yesterday, I started feeling some chest pain right in the center, and when I consulted a cardiologist online, they said it wasn't cardiac pain. But this morning after a little activity post-breakfast, I felt the same heaviness and then a dull pain in the center of my chest. It only lasts about 2 seconds and then disappears for a minute. The pain doesn't get worse when I breathe deeply either. Just wondering what's going on and what I should do next. Any thoughts?

take one pain killer and one antacid