WiTH GERDYou need a full exam and blood work. Especial screen for H pylori . Also stool screen x 3 for occult blood /parasite/hpylori . Given age over 50 you also need a baseline colonoscopy
. While you are getting these items checked out you should ditch to a gluten
free high fiber diet
. Ie gutbliss.com and Wholeapproach.com.