My cats nose had turned pale white?

I left town for two days, (on Wednesday morning) and came back today. He was being sort of quite, until I noticed that his nose was pale white. I thought he was cold, so I brought him up to my room and switched the heater on. Now he's just lying about, acting sort of normal, but he's being a little lazy. His nose has turned a pale pink now, not like normal. His meows are a little quieter, and I'm really worried. I don't want to go to the vet because I can't afford it right now, and I don't want to go unless it's necessary.

While I was gone, my maid came home twice a day to feed him. I got him a week ago. We are feeding him Persian kitten food, even though he's a long-haired domestic cat, but he's eating it fine.

I'm really worried. He's eating okay too, but his nose is still pale pink, his meows are quieter and mufffed, and he's being a little lazy.

Help!