I switched vets at the beginning of this month and that is how we got our diagnosis for diabetes. Jaxa was first sick in Novemeber; she threw up and had diarrhea several times over night so I took her to the vet we were seeing with our new puppy. They threw all sorts of antibiotics, probiotics, cerenia, dewormer, etc. at it but didn't even ask to do a single test. Two weeks later she went in for her vaccinations updates and I mentioned that she was eating a bit less, but they kinda blew that off. Another week and a half and she was barely eating her treats so we went in and they finally did some blood work. That was when she was diagnosed with pancreatitis. They gave meds, but the buprenex made Jaxa stop eating completely and two days later she had to be at the vet hospital for three days on IVs and feeding tubes. I really thought that I was going to lose her then.
We went home and she seemed fine until about two weeks after her prednisolone was gone, and then she had another bad weekend. She didn't stop eating but she threw up once each morning and was eating less. Went back to the vet, refilled prescriptions, her glucose was high and that made the vet suggest cancer. I asked about diabetes and he insisted no, not diabetes, cancer, and suggested putting her down immediately without further testing (except for the ultrasound which they would have to send me across the state to do and he thought wouldn't be conclusive.) I took her home, we used the meds, and she seemed to have a flare at the end of February, and we were getting by on prednisolone, cerenia, and mirtazapine. I had been reading about meds though so when she seemed to be in pain, and the vet hadn't given anything for that I called. And it took him two days to get back to me about her, knowing she was in pain. He switched us to cyproheptadine and ondansetron, but still nothing for pain. So I called a different vet office; the vet called me back the same day and we had an appt set up three days later, and all her paperwork was sent to them. That is when we got the diabetes diagnosis and they started us on insulin that same day, set us up with needles/insulin, and showed me how to do the shots. We have been back weekly for her curve tests, and they check in with us often.
I had asked the first vet about diabetes three times when she had high glucose (over 300mg/dl twice) and every time they just acted like I was reading too much online and I should stop worrying about it. Switching vets probably saved her life this month. If your vet doesn't want to work with you, explain anything, or ignores your concerns they are probably not the person you want for your kitty. If Jaxa was a child she could say where it hurts or when she doesn't feel good; but with cats we have to be their interpreters.