Is it tuberculosis? I am suffering!

I was having tuberculosis 1 and 1/2 year back! 1 year back i completed my course! Now I am having stinging chest pain with frothy transparent sputum( I don't know it is from my lungs or throat because I don't cough) whenever I irritate mucus comes but coughing is not happening or happening sometimes after eat  food! I have done x-ray test twice which is normal and sputum twice which is also normal ! Post nasal drip is also there ! But chest pain and frothy mucus is not going! What should I do because doctor is saying we have already tested you for tb twice and you are normal ! Pain started after i went Delhi at the time of diwali pollution and it's been 3 month since I am suffering !