Your vet ain't great on this. This is a document he could do with reading:
IDEXX Pancreatitis Treatment Guidelines
It has all you need to know about pancreatitis treatments.
As well as the suggestions above from Elise a course of B12 injections can really help a great deal when pancreatitis is in play. (At a push even a single dose might help a bit.)
Further info on nausea, vomiting and treatments for same can be found
here.
For info, Saoirse had an ultrasound done as part of the diagnostics for her pancreas issues, not an X-ray. With regard to the testing, the SNAP fPL will give you a yes/no result. The Spec fPL will give you a quantative result to indicate severity. It is useful to have series of Spec fPL tests done to assess treatment efficacy but, to the best of my knowledge and experience the value of the Spec fPL in no way changes the treatments that would be needed to treat the pancreatitis and, as such, the Spec fPL could be considered a 'nice to have' test, not a 'need to have' one - something to consider if working to a tight budget.
Mogs
.