Just to elaborate on something I said earlier, I wasn't thinking of your vet holding a grudge so much. More like sometimes I see vets get lost when they can't do the procedure or take the step that is most likely to shed light on the situation and illluminate the way forward. If they can't do the best thing, and they're scared, they are afraid the next best thing or the third best thing won't work, and they don't suggest it. Just being human.
An ultrasound could show a lot. Spencer had one a few months ago. It was $400, but this is Seattle and everything's ridiculously expensive. On top of that, the radiologist that performed it looked minutely at EVERY internal organ south of his throat. They were able to see tiny structures in the walls of the small intestine, for crying out loud, as well as minor abnormalities in his stomach. So I'm guessing that a quicky of the stomach could show what's what and probably for lots less than $400. Just offering this for comparison.
People here were kind enough to ride the roller coaster with Spencer and I and I'm sure we're not the only ones happy to pay it forward. Today's developments are encouraging! Keep us posted.
Praying for you!