What a pretty face. I have no idea about thread symptoms. Have you given him a hairball remedy? I used to have a little long haired cat who needed it regularly.
It's sad when our fubabies are ill or hurt. I cut the quick quick badly today on one of my dogs when trimming her nails. She is wrapped in gauze and vetwrap looking pathetic. Not because she's in pain, but because she got in trouble for removing the first bandage. At least pouting keeps her quiet.
Best wishes on your app't.