I recently have suffered from PND [POST NASAL DRIP], which came from sinus and housemite dust. I have had a lot of health horrors over the years but this PND tok some beating. It has been absolutely terrible with horrible throat clearing and cough.
I tried drinking ACV and honey (have to watch the honey coz of diabetes), breathing olbas oil (childrens one) from an inahler, malt vinegar and paprika, small amount knocking it straight back, make no mistake -- it takes some bottle to knock that all back in one go.... Finally, I made my own rinse spray with ordinary table salt and a pinch of bicarb [baking soda]. Can't say it's totally cleared as yet, still got a bit of a cough, and very occasional tickle, but is much better and bearable, able to live with it.
I tried Nasonex and that worked for all of 3 days which cleared the waful hacking cough up which was persistent. I might try it again, as I read somewhere just today is best to wash the nostrils out with spray solution first then that gives the Nasonex chance to get right up into the cleaned out nostrils.