Thanks for query,
You have allergic problem,may be due to internal or external factors.
Now a day pollution is main problem to produce allergic manifestation.
Find out the allergen by trial and error and try to avoid.
Due to chronic worm infestation also may cause allergy
If you have chronic sinusitis
or DNS this also may cause cold and cough
Go for blood for eosinophilia
Avoid cold drinks,fried and junk food.
You may go for allergy sensivity test.
Ok and bye,