Help!!! Cat's not moving, drinking or eating!

My 5 year old male cat named Decameron hasn't been eating anything for about 5 days. At the start he just slept and didn't do much, but rarely he went to drink some water. Me and my family tried to aid him by keeping him worm with some blankets, giving him water and various foods (he still didn't eat). He seemed to get better so we decided to not take him to the vet, but the problem got worse a couple minutes ago... He isn't responding in any way. He can't seem to move anything. All the closest vets are closed by now and it's really cold outside. What should I do?

I know I should have taken him to the vet earlier, but the vet is expensive and we aren't the richest.

Any help is appreciated!

He needs to go to an emergency vet asap.  Cats can get fatty liver disease if they don't eat for more than 24 hours and it's very serious.  5 days is way too long for a cat to go, and unfortunately he is now significantly weaker and may not be able to fight off the initial illness.

He needs to see a vet.

Your cats situation is an emergency.  You need to take him to an emergency vet or call the local vets to see if they have an after hours line.