After reading the post, through it looking like it being typed on a teletype machine <br>eak, I got tired. Your too tired to think about divorce/separation, because your already exhausted.
Is there a friend you could stay with a bit, closer to work? This could give you a respite if you decide you want to stay married, or a place to decide you don't, as well as a "staying here, so I don't wreck on the way home, as I started to fall asleep behind the wheel".