I have a VERY similar problem myself. I have runny nose almost all the time, especially during and after eating. Cold weather gets the sap running too. The PN drip has me constantly clearing my throat and my GF comments about it too often as well as the foul breath that she says is associatiated with the sinuses. She tells me her Russian Dr took care of her problem (same thing) a few years ago and the translation to english for the condition was something like antitis.
Of course my Dr put me on nasal sprays and Atadine(?) which does almost nothing to help.
I'm going to at least start using irigation with the nette pot(?) and see what happens as well as reading up on candida.