Hello there...this is purely a problem of post nasal discharge
...that happens in cases of severe sinusitis
...Steam inhalation 4-5 times a day for a period of 15 - 20 minutes, 7 day course of Augmentin if not sensitive to penicillin, tab ornidazole
to control anerobic infection with paracetmol (in case you have fever).... This would treat your sinusitis...but this is just a symptomatic relief..in case of frequent h/o sinusitis you need to get a lavage done...Consult your ENT surgeon for further clinical examination and management....