It's not diabetes, but he's definitely unwell. The vet suspects Cushings disease, which affects the adrenals, and would explain his symptoms of constant hunger/thirst, restlessness, some hairloss and weight loss

We're obviously pretty worried - Cushings is treatable, but the mass is a worry, and he's around 14 years of age......
Some VV vibes would be much appreciated please xxx
Here he is with his new best mate, our Daisy.