I agree with DWW, I think your cat might be constipated. If he's not eating and not drinking, that is cause for concern. Best to take him to the vet to be sure.
My cat stopped wanting attention, and he just wants to hide in his box all day. He wont eat much and he tries to poop but nothing comes out. He also isnt purring anymore. )?
Your kitty might have constipation .You know cats sleep 18 hours day out of 24 ?