I HAVE GERD AND HAVE BEEN ON NEXIUM FOR YEARS. GENERIC NEXIUM WAS SENT DUE TO INSURANCE. DIAGNOSED WITH MILD SLEEP APNEA. PUT ON CPAP. AFTER 4 MONTHS I STARTED A CHRONIC DRY COUGH. PFT SHOWED SMALL AIRWAY CONSTRICITON. STEROID INHALER DULERA HELPED BUT CAUSED HOARSE VOICE. STOPPED CPAP. LAST WEEK TRIED ZEGERID OTC. WITH IN 2 DAYS MY CHRONIC COUGH STARTED GETTING BETTER. NOW ON DAY 9 OF ZEGERID AND I TRIED MY CPAP AGAIN. DRY COUGH BEGAN AND I HAD TO REMOVE CPAP. CAN THE CPAP AGGREVATE GERD AND MAKE MY COUGHING WORSE?