My endoscopy results reveals lower third has mild esophagitis with LAX LES and Diffuse erythema in body and antrum. What does that mean?

The Word On GERD. It means you're all inflamed down there and some of it is leaking back up and affecting your esophagus. It also hopefully means other tests are pending(blood and stool tests for any stomach infection, blood test for anemia,etc) and information regarding what to do about your problem("Gastroesophageal Disease," or GERD). Until then,diet modifcation and use of antacids is inorder and,not lying flat.