My endoscopy showed hiatal hernia.. which practicaly means thr flap that needs to close to keep acid down does not closw all the way. I have been taking generic dose of omnaprazole for last few momtjs. They prescribed it for faily use but once when i could not ger medicine on time i was so mich in pain. Since the. I have taken it ever 3 days. May be get an endoscopy done.