Hurt kitten, any ideas?

I have a six week old kitten who was attacked by a dog. The kitten lived, but is missing part of his nose/upper lip, and refuses to eat or try to nurse. I've been feeding him with a syringe, a mixture of wet catfood and milk, and he doesn't like that either, though I try and get some into him every so often. Also, when he breathes it makes an odd ..... almost wheezing or farting sound. I plan on taking him to a vet if I can afford it, but any ideas on what might be wrong with him? Someone suggested crushed sinuses and that's also why he won't eat, because he can't breathe through his nose at the same time.