Dear OP I know how confused and stressed and tired you are. I am in the process of separating myself and most days I feel like driving away... far, far away from everything. 
I know that this is a very critical time and we may make mistakes in the process. My STBX and I do not own a house and have very little savings, so reasonable thing to do is not to involve lawyers, to try to preserve as much of that savings as possible, right? I am doing exactly that, but most days I just feel like hiring a good lawyer, giving her/him all the money I have and letting her/him deal with it all: my STBX and his moods, the property division, child support. I really do and one of these days I may actually do that. Because it is either my money or my sanity. My STBX actually agreed to move out, but he does not yet have place to stay. It has been six weeks since I told him I want to separate and since I have been sleeping in the same room but on the floor with him. It has been a nightmare. I cannot wait for him to leave, it is very difficult to stay with a person in the same space after you decided you no longer want to be married to them.
What I am trying to say is this, people tell you to stay in the house so that you may be able to keep it, but if that means loosing your mind, your sanity, if you are in danger, leave. I would say, listen to your instincts. All this time I have been married, I ignored my instincts and from your posts I would say, you ignored yours too. So, after all this time, forget reason, forget what everyone else says, just leave.
Sending you hugs.