Proper history needs to be given
Do u have history of bronchial asthma & allergies ? Which is nothing but difficulty in breathing,dry cough or wet cough ,the breathing becomes difficult when exposed to traffic pollution , cold air , pollen
The problem of cough ur having on switching on fan could be cold induced brochospasm (airway gets narrow and breathing becomes difficult a bit )
Next Steps
use ascorl - d syrup if cough is dry
use ascorl -LS syrup 5ml morning and evening if cough is wet
Health Tips
go to a pulmonologist and get these tests done :
PEFR testing
spirometry
dont be scared of these tests you just have to blow air into a machine thats it ✌
take care