To add to m L Briggs, my own cat was down to 5 pounds and put on thyroid
medication. She doubled her weight. You did say your cat had a complete
blood work up and so I would think thyroid would be included but you never
know.

Also, no clear x-ray image? Is his abdomen swollen? Maybe you need to have
another vet x-ray him on the chance that your vet's machine isn't working
well.

--
Barb
I can only please one person a day.
Today is not your day.
Tomorrow doesn't look good either.