Anyone Know Plumbing?

Well, we can't shower in our house unless we want to be boiled like a lobster. When we turn the knob from cold to hot only a trickle comes from the cold side (which quickly warms up) and as we get more and more pressure, it turns to scalding. We've had the opposite problem before: cold water works fine and then goes down to a trickle when the hot water would come on.

Does anyone know what the potential problem could be? We really want to feel clean and wash our hair.

All the problems we keep having really suck, let me tell ya.

ETA: Never mind. Our basement is flooded by a couple of inches and counting. The water heater/water tank is leaking. Fantastic.