Sounds like you have a blown head. The coolant is coming out due to extreme amounts of pressure. The alternator belt turns the water pump, so you had no coolant circulating.

The proper thing to do would be to pull over, open the hood, and turn the heat on in the car while the key is in the number 2 position (engine off).

Sorry but it looks like you have some engine work to do now.

Dkr.