Last five years I am having a severe cough with throat irritation always, doctors advised tb gold, test, results negative, visits ent surgeon, checked for food allergies, some items said to avoid, consulted chest physician diagnosis brittle bronchitis, recommend foracort 400 oral spray, observed using oral spray coughing increases uncontrollably. My work involves visiting. Companies where there is oil fumes, dust's, etc, please help to get rid of cough permanently. Also during cough the saliva coming from throat is sticky, sour taste. What are these symptoms? Would appreciate if some doctors suggest the right treatment. Allopathy can cure or suggest for a permanent solution.