Below is an extract taken from your passage on this (EC) Site concerning Post Nasal Drip:-
All well and good so far as it goes but my favorite pharmacist asserts that, "Quite often a person will not realize that 'e is suffering from this condition, even though experiencing other symptoms consistent with same - as they do not feel anything actually going down the throat even though it is". Now there's a conundrum!
I came away with some Codral lozenges with advice that I might need to embark on a course of anti-histamines but have struggled on without the latter, as I am not a great fan of them, except if desperate. So back to the Codral lozenges, Manuka Honey lozenges, Salt water gargles and sucking on a lump of Coconut for as long as I can keep it in mouth, especially prior to retiring for the night. No phlegm or such, just a dry hacking intermittent cough with attendant sore throat. Also gets into the URT a bit further down unfortunately.
Now here's the rub though. You will struggle to find a doctor in this neck of the woods and as I was not actually in a comatose state, I was referred to the nice lady ('phone) nurse who was most sympathetic but claimed that it "Was a virus doing the rounds and that some people took MONTHS to shake it off". Thank you very much - is there no end to one's suffering these days?
Here is the relevant EC passage for your perusal & to wisely ponder upon:-
Post-nasal drip is a condition of the mucus membranes of the sinuses, which causes the presence of a liquid dripping feeling down the back of the throat. While specific treatment of the condition depends on the cause of the problem, natural treatments offer relief whatever the cause.