Feeling blessed

Pro tip: if this ever happens to you, turn the heater on full blast. It'll vent the heat from the engine compartment in to the passenger cabin. It sucks for you, but it'll save your engine. If the vents blow cold you are out of coolant and you MUST STOP or your engine is a goner.

fan belt might have gone

That's true. In that case, you could just use your heater for a while, right?

you can stop it and let it cool down, you need to replace it as soon as possible before the engine seizes