Do not be Intolerant to Cough...
Cough is by and large protective phenomenon for airways, and sometimes last for weeks as post viral hyper sensitivity to cough receptors.
There are very few causes of cough, where treatment is quickly effective like Asthma, Adenoids infection, Tonsillitis, Ear infection, Pneumonia. But these are not very common as believed by parents. 
Keep trust in your doctor, always ask him for his impression about disease. Get reassured about normal examination, your doctor understand warning sign in your body...
Milk, Curd, Orange, Banana and Bathing don't exacerbate cough.
T.B. is common where child is in immediate contact with an adult with tuberculosis.
Now No more intolerance...