My father is coughing since last two months. His coughing is really very bad. He says he feels like he is dying while coughing. He gets that coughing all day long even at night. He gets wet cough. We consulted 2-3 doctors one of them said my father's throat is swollen on inside. He gave him medice but that did not have any effect on his cough. Also he feels suffocated after coughing. I am very much concerned about my father so please tell me what is actually causing him cough and a remedy for it