My opinion is neither.
There's a good possibility that your doctors got all this wrong!
I suspect that you might actually suffer from hypochlorhydria (low stomach acid) and not too much acid.
If my suspicion is correct, this could change things for you, dramatically!
In low acid situations, intra-abdominal pressure increases, pushing the lower esophageal sphincter to open, so even the presence of a small amount of acid will cause a lot of pain and burning symptoms.
The majority of people on anti-acids for gerd symptoms, have low acid levels! Not an ideal situation for trying to stay healthy.
Healthy Stomach acid levels are vital for absorption and assimilation of nutrients/minerals/ proteins, for destroying harmful bacteria in the stomach and preventing bacteria moving up in the stomach from the intestines.
Your symptoms you mention are more consistent with low stomach acid.
But, you don't have to take my word for this.
All you have to do is a Betaine HCL trial (very inexpensive)l, as a test.
Follow the instructions on the label and if it helps and if you feel better,
your acid levels are indeed LOW.
So should this be the case and you have a few days to a week of feeling better on beataine HCL, it might be time to ditch the Omeprozale and cancel the ultrasound.
For the gastritis, you can try demulcent herbs, which can soothe and protect irritated or inflamed internal tissues.
Look into aloe vera , slippery elm, licorice...
Please note that my suggestions are not a substitute for medical advice
-actually most conventional doctors would disagree with me, but at least
I don't have any professional bias and nothing to sell.
Best wishes,
Niko