Thanks for your question on Health Care Magic.
I can understand your concern.
Breathlessness is commonly seen in
bronchitis. Get a chest
x ray done, if it is normal, no need to worry.
Possibility of bronchitis is more in your case.
So better to
consult pulmonologist and get done clinical examination of respiratory system and PFT (Pulmonary Function Test).
PFT is needed for the diagnosis of bronchitis.
It will also tell you about severity of the disease and treatment of bronchitis is based on severity only.
You may need inhaled bronchodilators and inhaled corticosteroid (ICS).
Second possibility is
GERD which should be treated appropriately with antacids.
Don't worry, you will be alright.
Hope I have solved your query.
Wish you good health. Thanks.