I came down with the flu at the beginning of last month. Even though it s gone, I still have an irritating cough that won t go away. Started off coughing up phlegm but now it s just a dry cough. Have tried everything to get rid of it. Robitussin. Mucix DM pills, Mucix DM medicine, Vic vapor rub, Nyquil, Dayquil. Yet it still is on my chest.Yours sincerely Lawrence Emanuel