Thanks for your question on Health Care Magic.
I can understand your concern.
You are having cough only in the day time. So possibility of
allergic cough is more.
Allergy to environmental things like dust, pollens, mites, animal fur, smoke etc is causing you cough.
Another possibility is chronic
lung infection like
tuberculosis.
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 lung infection.
PFT is must for the diagnosis of allergic cough.
You may need inhaled bronchodilators and inhaled corticosteroid (ICS). Oral combination of antihistamine and anti allergic drugs are also indicated in your case.
So better to first diagnose yourself and then start appropriate treatment.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.