While GERD/LPR can cause lots of sinus/throat/voice symptoms, so can allergy. Have you been tested to see what you're allergic to? With allergies you can develop chronic sinus irritation/infection, which will create the symptoms you're describing.
I do have PND, and have had it my entire life. It sometimes decreases, but I pretty much always have it to some degree. When I'm dealing with pollen season, it really increases. Also, when the heat turns on in winter, the dry air causes my PND to increase.
Just want to suggest that GERD/LPR aren't the only cause.
Good luck with it! I have times when it's pretty controlled, but PND is a tough "nut" to crack, so to speak.
Nissen Fundoplication 2/09
"Whatever you fight, you strengthen, and what you resist, persists.”
“Worry pretends to be necessary but serves no useful purpose”
“Accept - then act. Whatever the present moment contains, accept it as if you had chosen it. Always work with it, not against it.”