I woke up this morning and I have no hot water in my shower, the bathroom sink however is hot and cold water, and at the same time my kitchen sink has no cold water, screaming hot water only! I tried to let them both run and still nothing and I'm at a loss! And everything else is fine! Can someone help, I know nothing about this stuff!

You have a crossover somewhere. An open faucet is crossing over and feeding the other