Thanks for your question on Health Care Magic.
I can understand your concern.
By your history and description, possibility of
bronchitis or
lung infection is more in your case.
It is due to inflammation and edema of airways.
Your symptoms like
cough (not improving with routine drugs), phlegm and heaviness in chest etc are seen in bronchitisbronchitis and lung infection.
So better to
consult pulmonologist and get done clinical examination of respiratory system, chest
x ray and PFT (Pulmonary Function Test).
Chest x ray is needed to rule out lung infection.
PFT is needed to rule out bronchitis.
You may need antibiotics, anti inflammatory, inhaled bronchodilators and inhaled corticosteroid (ICS).
Don't worry, you will be alright. First diagnose yourself and then start appropriate treatment.
Hope I have solved your query.
Wish you good health. Thanks.