I completed my tb treatment 9 months back, 2 months ago I went to delhi from where I got flu may be because of pollution! From that day i am having chest pain and a thin transparent frothy mucus is coming out when I irritate.but their is no coughing ! It's a sting like pain at centre and at two points at left and right! I am in touch with the doctors of civil hospital gandhinagar where they took x ray test two times sputum test two times and cbnet 1 time which came clear with no infection! But still mucus and post nasal drip is not going and from last two days chest pain got increased ! What should I do doctors are saying that their is no tb