I have a history of severe Sinusitis in my high
Thanks for posting the query
You'll need a examination by ENT specialist to rule out the cause of the postnatal drip.
It could be chronic sinusitis also with out other symptoms.
Gargle the throat every day with XXXXXXX warm water. Mucolite syrup, antihistamines and decongestants like Ebast DC will reduce the plegm, available only on prescription.
kindly get examine once
Any issues do follow up