Well, the Proot had a reasonable night, we slept downstairs with him. He joined us briefly for a Very Big Purr at 5.20am, but wasn't up to biting my head or trampling over my pillow. Not exactly feeling optimistic, but he's brighter and more comfortable than yesterday evening, said "Proot?" this morning as a greeting and has eaten a little. I think he's wondering why we're both snivelling all the time....
Amanda, many thanks for the info - we had asked about Felimazole, but the vet doesn't think it's contributing, and thinks if he comes off the Felimazole now it would be dangerous as his system couldn't cope if his heart rate increases.
He's on Oxycare in case of infectious anaemia, the vet changed him off another antibiotic. Vet didn't do a blood smear on Monday he wanted to give Proot a break from sticking needles in him and started the antibiotics on the basis that they wouldn't do any harm, but might do some good.
Going in at 11am. We're seeing a different vet so will have a good discussion with them.