Sure sounds like pancreatitis to me....which I have an unfortunate amount of experience with. Several of my dogs have had acute attacks, two now have the chronic form. It's not fatal, if treated, but it is painful. Even the chronic form can be managed. Paxil is fourteen, had it for years, and still doing well.

The danger with an acute attack is dehydration. Digi likely needs to be hospitalized and on IV fluids for a few days with no oral intake of anything. The digestive system needs to shut down for a bit to reset itself. Then very small meals, very bland food. NO treats, no fat likely ever again. Pancreatitis is most often triggered by a fatty treat(gravy, roast drippings, pigs ears ect).

Paws crossed for your girl. PM me if you want more details on what we did with my dogs!