We've tried everything to get him to eat. Wet food, dry food, moist food, warm food, and so on. Nothing. So far, he doesn't look like he's in critical danger. While he doesn't eat, everything else about him is normal. He purrs, he plays, he rubs, he loves. He's not just lying down, so I think for now he's good. He acts like he's hungry, but he just doesn't eat when given the opportunity. So he's hungry, and he still has his appetite, which I think is a +1. He IS going to the vet at 8 AM tomorrow, when it opens. So we're getting him in as soon as possible. He is in a bathroom with heat, water at all times, and food in case he decides to get hungry. I've been keeping his airways open by wiping him clean and keeping the room a bit more humid (with steam from hot water). We're trying our best.
Thanks for all of the quick info, I'll update with the info we get from the vet tomorrow.