I get severe cough normally at night and only during the cold weather like rainy or winter season. Once the mucus is taken out cough stops and when the mucus is formed cough starts again. I feel difficult to breathe when mucus is formed. I was prescribed 'seroflo rotahaler' by doctor a year back. This medicine gives me relief when I get severe cough and difficult in breath. Also I have dust allergy. So what is the actual problem and help me with the permanent solution for cure.