Hi. I am so sorry that Naomi is not feeling well and I know this is also very stressful for you

. I am happy to see she is at the vet—and I am assuming it is your regular vet vs an internal medicine specialist? Given all the disease states involved, getting Naomi to an internal medicine specialist would most likely be best at this point. Typically, internal medicine specialists can be found at emergency/specialty clinics or University hospital settings. Regular vets are essentially the equivalent of our primary care physicians vs the internal medicine specialists who are like our own specialists and must go through additional years of education and clinical training managing more complicated and challenging disease states like pancreatitis, diabetes, CKD or multiple issues at once. They are often best with new or acute situations, diagnostics needed beyond labs, diagnosis as well as establishing the best treatment plan/course. They are more comfortable with diagnostics and treatments many regular vets are not comfortable with—-such as the fluids with diabetes and CKD. I understand & appreciate their discomfort with a treatment with a challenging case but that is when I wish they would recommend that you take your cat to an internal medicine specialist vs not offering treatment that may be helpful &/or even necessary during an acute situation.
Dehydration does effect Creatnine and BUN values so that is a factor that may be effecting those #s as well as any infection or inflammation. It may not be the only cause for increased in lab values, but it can be a contributing factor. This is why during and also once a cat is stabilized, any infections are treated, pancreatitis flares addressed, etc, repeat labs are very important along the way to assess what is improving or what is still an issue.
Thoughts and prayers your way