Nancy, just FYI he seems to be a tough sell on the testing front, that's why Peggy hasn't been able to squeeze more data out of him...
Peggy, I hope he is feeling better soon!!!! If he is not eating well, I would call your vet in the morning and also post on Health for suggestions (and here, but there's more traffic there). It's imperative that diabetic cats eat, so something to be on top of more so than with a civie.
Also do you check his pee regularly for ketones? If not I would definitely start.