I am having coughing since more than 3 months, now i am having serious one with too much thick(yellow coloured) mucus coming out, and some kind of sound(i think so because of cough) from chest is also coming while i breath which creates disturbance because of that i am unable to get proper sleep in night. My nose are also blocked alternatively,also having problem while breathing. I visited to ENT specialist and doctor told me i have allergic to dust. I am worried very much. Please please let know if there is any specialist doctor to look into matter and also remedies. History--When i was 10 year old i had asthma problem, but later it was treated properly with medication.