I am sorry, but probably the doctors you were seeing were simply incompetent. Auras in migraine can be almost anything, even intestinal pain (or diarrhea in some cases).

Also, the paper simply describes a new observation in a very well-known fact. Nonetheless, that the vagus nerve IS connected with the gut is known probably known since Vesalius' time. The paper does not describe or explain your intestinal pain, neither gives you any kind of "I told you so" right against your physicians.

Arrogant physicians is one thing, incompetent is another.