Wow! Thank you all so very, very much for the quick responses. We are both so very soft when it comes to animals (of course, especially our own) - it's so good to hear so many people are out there offering help/support. Much appreciated and needed by us at this time - it was a shock for both of us. About a year ago he was treated for an over-active thyroid and had a successful op. He's been fine since, although his weight loss has concerned us - this was what pushed us over the edge; he's normally so very clean. At least he's mostly doing it in the right place!
I've booked in for a 9.30am appt on Wed with another vet in the area as to be honest, our current one is a bit well, cold. He just doesn't appear to be a major animal lover - or at least that's how he comes across to us. The new vet has asked us to just put Billy onto the KD Diet for now, so although I gave him his first dose of Kaminox and Fortekor this morning, I will hold back and wait until I have seen the other vet. He is also going to get Billy's history and blood results. I think I would be happier to stage the introduction of drugs, rather than give him several at once. Good point about the urine sample - my current vet didn't ask for one, nor did he check Billy's potassium levels. So that concerned me a bit - hence the 2nd opinion next week.
I just hope to god that Billy is with us for a long time yet. You always know that these things will eventually come about, but no matter what, you can never prepare yourself. I had a little wail about it on my own in the toilet yesterday (after hearing the news from the vet), and I dont mind admitting that I'm a 37yr old bloke. Pet's have always done me in. We're as bad as each other, but I'm trying to be upbeat about it all in front of the missus!
Thanks again everyone!