My mother 67 yrs old has dry irritation cough, done all the required test from blood, xray, eco cardigraphy, ecg, all the report are good and shows no problem. shown many doctor but still she has this problem of coughing especially early morning after waking up she continuosly coughing, cud you please tell me any remedy or medicine by which she could get some relief im worried for her. she is very weak.