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It is not normal, and unfortunately you are at the point to go into the next phase of diagnostics.
The may suggest endoscopy with xrays. You can call tomorrow and request a trial run of Reglan (antinausea) medicine and see if it settles things down, but I do think you are at the point that something more needs to happen.
Unfortunately, when nothing comes up on the first line diagnostics..and the dog fails to respond to treatment...you are in need of going the next steps.
Addisons is not too $$ to diagnose.
I think your dog needs to start with basic xrays...and then possibly contrast xrays. They give a dog a mix of food and contrast media and immediately start taking xrays so they can see where it goes and where it "hits" the problem...etc.
It may be done before other diagnostics. The Reglan is the next step as far as the treatment...but I think I would at least do the contrast xrays to see if this problem is actually in the esophagus or the stomach.
No, xrays are just that...ultrasound is a different way of looking on the inside.
It isn't GDV or bloat, both are acute and fatal.