Faith, it is incredibily strong of you to make this move to separation. You know what, you can file for divorce, and wait and see what happens. You aren't going to be divorced tomorrow, so try not to worry about tomorrow. Tomorrow will take care of itself. This separation will hopefully give you some time to really start feeling like a normal human being again. That is a good thing. You can think about divorce, later down the road as the date gets closer.
My attorney, here in Kansas told me the same thing about a legal separation. Unless you are very concerned about financial things, and him ruining your future financially, then it would be a waste of money to get a legal sep. That is a decision only you can make.
Take care, and I hope you can find some peace and contenment in this "new" life.