Hi I Got Cough Asma Its Worse At Night But

hi i got cough asma its worse at night but my doctor said its not asma just sounds like that and i cant have milk coz get more coughing after a cough get sounds like asma ,am i ellergic with milk or samthing else and got cough nerly more than 8 months i have done blood test also but nathing ,am using a RESPIGEN PUMP TO breath well after cough please help me with other things to sort out my sickness.[MONA]