I've been dealing with some chest issues after a trip to Delhi about two months ago, probably because of the pollution there. Ive got this persistent chest pain that feels like its stinging in the center and a couple of spots on the left and right. Theres also this thin, transparent, frothy mucus that comes out, especially when I get irritated, but strangely, Im not coughing at all. I've been in touch with doctors at the civil hospital in Gandhinagar. Theyve done a couple of chest X-rays, sputum tests, and one CBNet, and everything came back clearno TB or anything. But the mucus and post-nasal drip wont go away, and the chest pains gotten worse over the last couple of days. What could be going on?

take a course of antibiotics