They couldn't find anything wrong with him. Joyful joyful!!
He still wouldn't eat much when we got him back here, but he also was sneezing. Cats insist on testing food aroma before they will eat it and whatever the systemic illness was, it put his smeller off. He'd eat the smellier treats in our repertoire, but that was all, last night, apart from a syringe-feeding that did not go well. It seems to be slowly improving, and he's now eating odoriferous wet food.
Still not allowed outdoors until we get him back to normal. Not happy, but no lethargy. Grateful tonight.
And just WHEN are you going to open this &$^% door??!