I have always told myself things will get worse before any chance of better. I think you need to accept that. Unfortunately for you you don't have to have a separation before divorce is allowed. Either way the divorce Is a piece of paper. That is it.
I am in my situation and am afraid things still need to get worse. That is going to be a tough pill to swallow. But I made a decision I am in this until my heart and mind check out. I'm ready.
Think of it this way.
M 37 W 34
T 12 M 8 D 7 S 4
Need break 4/12/15 W no ring 7/7/15
Separate room 4/12/15 Separate living suggested 8/15 W moved out 11/1/15