I can't get re-hydrated, help!?

I've been dehydrated for a little while now, and only recently started drinking A LOT more water, the past 4 days or so. But nothing's changing. I'm drinking a lot of water, and some gatorade, but I'm still hot and I have a sore throat, headaches as well. I'm not peeing as much as I thought I would either. What's going on? Should I keep drinking? Help :[