Chest tightness with shortness of breath

I have chest tightness and shortness of breath since 4mnths and I used to have grey colour in my sputum since 6mnths once in aday daily.I went to genral physician he order sputum culture and xray and ecg.sputum came with streptocacci pneumonia and xray ecg are normal.He adviced me to take novamax 500mg daily 3 times.Even then I felt the same chest tightness and grey colour sputum physician ordered CT scan which came with fabriotic strands on the upper right lobe.Physician said that it is due to past infection. Now am not using any medicine .can any one suggest what to do next am feeling chest tightness and shortness of breath sevearly. I already had all the tests related to heart which all are normal.