Hi, so last week I got a 9 week old kitten and I noticed how she would sometimes make like a pop sound in her mouth or nose. I thought that maybe she got food in her nostrils or something. But recently when she meows it's very hoarse and crackles. Kinda sounds like a old dying cat type of meow. It's not like the high pitched meow every kitten does it's soft and sounds like somethings in her throat. I asked on yahoo what it was and somebody told me it's a upper respiratory infection. I'm really terrified because they said it could be life threatening. What are some products or medicine I can buy to cure her?