PND and GERD symptoms

Hi.  I'm wondering if severe post nasal drip can cause hiccups, belching and nausea.  The stuff drips down my throat all day long.  My nose is stuffed up so I've become the dreaded "mouth breather"!!!  I'm assuming the PND is causing me to belch and hiccup as it goes down the back of my throat.  It feels like a big ball of junk in my throat.  Any suggestions?  I take Zyrtec and Singulair.  Is this just something I need to suffer?  I pretty much have the PND all year long but it's especially bad now.  Thanks for any tips you can give me!