So, Thor went back to the vet this afternoon. Exactly two days after Loki realized he was not some impostor Thor and stopped hissing at him.
So, Thor has not been throwing up as much, but still some. I asked for (and received) an X-ray just to make sure there wasn't some sort of toy/fur/rubber band/masking tape bezoar in his stomach that was just partially obstructing the intestinal sphincter.
Nothing there but still some stool up in the transverse colon. So he got another dose of sub-cutaneous (or more accurately, sub-hide, fluids). No enema this time for which I'm sure Thor was extremely grateful. We'll double up on the hairball/laxative remedy and see how it goes.
He had lost a tiny bit more weight (he'd lost an estimated half a pound when weighed last week). So I have orders to fatten him up.
But not to let Loki gain any more weight.
I bought him some kitty treats and some of that yummy tasting but not so good for you dry cat food. Tomorrow I'll try to find some kitten food as per the vet's recommendation.
Loki sez: I'm not fat. I'm just big furred.