Lost all coolant/water via hose that came lose. Car will not start.

Driving on the Interstate about 75 mph my car started to lose power. Dropped to 40 mph quickly then as I was braking to get the car stopped in the emergency lane smoke/steam (?) Began bellowing from under the hood. The car died. I raised the hood and after 15-30 seconds all the smoke was gone. I could see green coolant pooled on the drivers side of the motor. I checked the oil and it was/is full. No "milky" sign. No watery sign in the oil. Car would not crank. I could hear a sound when turning the key that sounded like a sewing machine, a very weak spinning sound. The radio and head lights work. I am in a real bind. Very little money. I hate to sound like a cry baby, but this incident may ruin any chance I have of making my life better. I am so afraid that I have done major engine damage. I noticed that a hose on top of the motor had come lose. The hose is right below my coil pack. Please advise. Thank you.