Hi, also important is to rule out GERD i.e gastroesophageal reflux disease. Try a course of omeprazole 20mg daily for 2 weeks, if relief is seen, probably you have this disease. Get an endoscopy done to find out the cause later.
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Hi, probably because of "post nasal drip" you are having these symptoms. This is a condition in which excessive mucous produced by inflammed sinuses dribbles down the throat.
Consult an ENT doctor, try steam inhalation, nasal irrigation, antibiotic course(amoxicillin, levoflox etc) along with anti histamincs.