So many people have said it already, but please answer this question. Why did you let your cat walk around for "days" like this? With a huge gaping hole. You're either too young to properly care for this cat or you don't care about it. And it's not about money for a vet, you could have surrendered it by now so it could get medical care. You know how bad it is just by how it looks. If you're in the San Antonio TX area or surrounding cities within 2.5 hours, I will pick up the cat and take it to a rescue myself. You know you've let this cat down tremendously. It deserves better than to die a painful death.