horseness, laryngitis, clearing of throat and Gastroparesis

GASTROPARESIS: Has anyone heard of stomach acid accumulation caused by this condition and its effect on the larynx, affecting voice ? I frequently feel mucous at bottom of larynx, having to clear my throat and horseness some coughing. I do get dry mouth while sleeping at night. When I talk extensively or at loud pitch, my voice gets raspy. I was recently diagnosed with GP by use of radioactive gastric scan but seem to have none of the other symptoms associated with it: no heartburn, no nausea, no bloating, no vomiting, able to eat large meals. Cause of the GP my go back to stomach surgery that I had 50 years ago, where the vagus nerve was cut, resulting today in lessened motility. Gastroenterologists are at a loss to ellucidate this laryngetic condition, ascribing it to GERD or a form of GERD called L.P.R. ( laryngopharyngeal reflux). Would Iberoblast or Doperamide help ? I have tried Protonix, a PPI,  with no help. It may be that I have 2 unrelated conditions: GP and this L.P.R. ????? Please help if you have any input.