Acid reflux can affect the esophagus (GastroEsophageal Reflux Disease-GERD) or the larynx (LaryngoPharyngeal Reflux-LPR). Some folks have just one, and some have both.
I had LPR, and in doing the research for it, most docs recommended a PPI such as prilosec, 20 mg twice daily. I, too, had lost my voice, had coughing and gagging, and a constant feeling of a lump in my throat. I actually got my voice back within a week, the coughing, gagging, and lump took longer.
If you want to know more, Google LPR rather than GERD. You'll find lots of info. A while ago there was a post entitled something like "the difference between GERD and LPR" with a link to a good article.