Dehydration TMI

I've been feeling really really dehydrated recently. I drink A LOT of water. My mouth is constantly dry, I get headaches like crazy, and my pee is really strong smelling and dark. I have to pee all of the time and I wake up a Lot to go but I still feel super dehydrated. I really do drink a lot of water and it's like no matter how much it doesn't change. Has anyone else been like this??? It's making me nervous.