Good news from the vet!
I took my kitty Ham in to get some bloodwork done (he's in a fairly advanced state of kidney failure) - and they said he's still stable!!! My feet are tired from doing the happy dance, and my wallet is significantly lighter, but I am so glad!!
His heart hasn't been damaged from all the fluid I've been pumping into him (they can still hear a murmer, but he had that before), his blood pressure is good, he hasn't lost any weight and most of his blood values are within normal. Creatinine hasn't risen much at all, and his urea has gone down again :-)
I was so worried that he'd be in decline and he'd die while I was in Florida visiting that I almost couldn't book the trip, but now I can breathe easier.
And he might get to spend another summer outside in his favourite chair, under the ostrich ferns!