When these dehydrating gastric attacks started last year, every 3 to 5 months, we naturally diagnosed them as viral gastroenteritis. When they started repeating every 4 - 6 weeks this year that obviously stopped being a credible diagnosis.
There is a somewhat remote possibility of a gastro neuroendocrine tumor. The test to pursue that - a capsule endoscopy - failed because I didn't pass the capsule for over a week - it got stuck somewhere and the battery died. What indicated the possibility of a tumor was a test called 'chromogranin'. I took the first in the hospital - a Mayo protocol, and a second one a month later - a different testing protocol. Both showed 'high'. But the test is only a pointer, a 'marker', for the tumor, not diagnostic, plus the tumor might be benign.
I am up to my ears in tests plus working out the logistics. It is like a full time job! :^) I have had to cancel the hydrogen breath test twice due to unavoidable conflicts with the week long prep. Hopefully Friday next week.
Lots of logistical problems which I patiently work my way through. It is part of the process.
.