I am 78 years old and have been to every doctor, pulmonary, ent, allergist and internist to try to figure out why I have copious amounts of thick clear phlegm in my throat all the time. I cough so violently they I am afraid I will not be able to catch my breath. I have been on Prevacid for 30 years but still get heartburn and take baking soda and water at night. I don’t know what to do I feel embarrassed to go out sometimes because I can’t control the violent coughing. Don’t know what to do. Had an endoscopy in December and it showed nothing.