As Een said, endoscopy is nothing. I have had them since 1994 every two years due to GERD.
As for Prilosec, my doc has had me on it non-stop since 1994 without any problems.
You may even have Barretts, with is pre- esophageal cancer.
If I do what the doc orders VT, no problems, none.
Do not screw around on this!