Can the damage of the esophagus caused by stomach acid from GERD be healed?

Yes. Yes, many medications can heal acid reflux. The strongest medications fall under the class of proton pump inhibitors. They block stomach acid production and can heal erosive esophagitis almost 90 percent of the time at 8 weeks.
Yes. Suppression of stomach acid production with medications, over time, can allow the damage within the esophagus to heal. However, given that the issue that usually causes gerd, a hiatal hernia, is a permanent structural anomaly, damage does tend to recur once medications are stopped.

Related Questions

I've read gerd/heartburn is often caused by low stomach acid and not too much. Is this true or more of a holistic/natural type point of view?

Not true. GERD is caused by contents in the stomach coming up through the esophagus, which in turn has a poorly understood cause. We think it is probably due to too many random openings of the valve. Certain medications can also cause the valve to open, as can stress, obesity, & problems with the stomach emptying to name a few. Hope this helps!

Can GERD really be caused by low stomach acid? Could be why 5+ rx's made me worse? Any standard tests to find out or is it more trial and error?

Reflux. People with low stomach acid can still get reflux if they have an incompetent valve at the junction of the esophagus and stomach and eat large meals, recline after eating, are obese or eat fatty or oily meals which slow stomach emptying. If there is some acid in the stomach caffeine and chocolate may give them reflux also. An old fashioned upper GI series and barium swallow may help in diagnosis.