you may be allergic to drugs taking for other disease
like paracetamol ibuprufen vtamins calium iron diet suppliments
local soaps shampoo oils cooking oils can cause this
any food pollens or clothes an be cause
you have to find out allergens causing it by allergy tests
till the can take antiallergic tab montelucast 10 mg bd
bronchodilaor syp bd
and antacid gel tds
lot of warm water

Hello,

Thanks for posting on HCM,

From your description you may be suffering from paroxysmal nocturnal dyspnea/or PND (refers to attacks of severe shortness of breath and coughing that generally occur at night). Difficulty breathing at when sleeping/lying flat is known as orthopnea which could simply be relieved by sitting upright.
It may be caused in part by the depression of the respiratory center during sleep, which may reduce arterial oxygen tension, particularly in patients with interstitial lung disease and reduced pulmonary compliance.
In order to properly determine the most likely cause of the difficulty breathing a doctor would have to examine you by taking your history, examining you, running some tests including blood tests, Chest x-ray, cardiac ultrasound etc.
Ones cause is determined, a treatment can be initiated that can give you some relief.

Hope this helps
Dr. Nsah