Thanks for your question on Health Care Magic.
I can understand your concern.
Since your chest x ray is normal, no need to worry for
lung infection (
pneumonia).
By your history and description, possibility of
bronchitis is more.
So get done PFT (Pulmonary Function Test) for the diagnosis of bronchitis.
It will also tell you about severity of the disease and treatment of bronchitis is based on severity only.
Along with inhaler, you may need
mucolytic, anti inflammatory and expectorant drugs.
These all will dilute your sputum and makes it easy to cough out.
So
consult pulmonologist and discuss all these.
Hope I have solved your query.
I will be happy to help you further.
Wish you good health. Thanks.