Why is my kitten doing this? (Please help me!!!)?

I think my kitten is sick! I got him over a month ago and he is 4 months old. He keeps kneading on stuff, and has not been playing today. He's been really calm and sleeping a lot, he is dehydrated because his nose isn't wet, and his body temperature is above normal, I think he has a fever. He hasn't been eating... This started today, I thought it was because my mom gave him wet "Aristocats" food yesterday, but it's for cats and kittens. A few weeks ago, we saw that something red came out of toosh, I think it was a parasite. Do you think this might be it?