I also have the symptoms of stuffy nose, constant post-nasal drip and searing sore throat that. Even my ear canals are burning. I also suffer from the esophagus burn, the upper stomach pain and burning. Sometimes it feels like a hot poker is being driven right through my solarplexis. I have trouble swallowing. These additional symptoms started up after April when my husband and I travelled out of the country and got sick with a Rota Virus while on vacation.
I have been on PPIs for 10 years but the Nexium pretty much seemed to control my symptoms. I didn't stop drinking my morning coffee or evening dinner wine until we got sick with the Rota Virus. A recent endoscopy revealed that I have Barrett's esophagus near the LES. How did that happen without me noticing! I've had acid pain for years, sure, but didn't know it was progressed to Barrett's. I never had an abnormal endoscopy until recently.
I think the nasal stuffiness and post nasal drip are related to GERD. An ENT doc told me that acid will irritate the tissue in the throat and cause the body to react as if it is allergic -- producing inflamation and congestion.