How to stay hydrated?

KC
Yesterday was really hot and I was drinking water all day long, but I swear I didn't have to pee at all, really weird. I woke up this morning sick. I think I caught this 24 hour bug everyone has or morning sickness just hit. Either way I am so thirsty, I can tell I am dehydrated and I can't keep anything down. I don't know what to do but I feel horrible any advice? I have been googling all morning!