Hi - Gastritis is not 'd'. It is inflammation of the stomach lining.
Acid reflux is also called GERD which stands for Gastro Esophageal Reflux Disease. Stomach acid "backs up" and refluxes into the esophagus causing heartburn.
The esophageal sphincter opens to let food into the stomach. When this sphincter does not work properly, it becomes "lazy" and opens up and lets acid flow back up into the esophagus causing pain. If the lining of your stomach is inflammed, this may be causing your esophageal spinchter to become lazy and open up. If you get persistent pain in the chest (heartburn) go to your doctor and tell him/her that losec didn't work and you need to try something else. I am on Pantoloc and it works well for me. Nexium is another option.