we live in barbados,my son has a dry cough for over 20yrs,he is 28,,,,he has seen the ent and pulmonary specialist,,,all types of test were down,all came back negative,,the only time he doesn t cough is when he is lying down.as soon as he gets up,the cough begin,,,sometimes in the space of one hour,i would count 50 coughs. we are at a lost,its very frustrating,,,can you please help.