Hi welcome to Health care magic forum . The reasons for persistant couugh, with out findings in the lungs might, Uvelitis a grouth at the end of the throat, by touching the pharynx cause severe cough
. For this type of cough you need to use cough supressants like dexametarphane, codeine
, ect which are present in some cough syrups.
Best thing to get relief immediately is garling with luke warm salt water 2 or 3 times a day . Avoid taking fruits, juices, ice creams, ice water to drink , avid air conditioners till you get relief, and you can use them after relief.
I advise you to consult an E.N.T.surgeon who is the doctor concerned with the causes in the pharynx.
Wishing for a quick and comfertable relief and thanks for calling.