Troy , stop being so paranoid and worrying about the worst case scenario.
As I said on the phone , it is probably the rad cap has lost pressure and allowing the water out of the overflow.
The murky colour is because you have probably boiled the water when it stopped and it's like giving the block a hot enema , all sorts of shit will come out.
Drive it home tonight , take it easy and don't use the aircond.
Get a new cap in the morning from Auto one , Marlows , Coventry's , whatever.
It's only a cap and the same as dozens of others.
Cheers
Ken