Echo Theo... move back in now... move into a separate room/basement. This usually falls under the category of "separated" if it comes to that.
Seek legal advice.. especially about moving back in. I was about to move out when I read similar advice and decided against it. I told her if she wanted out.. she'd have to move out, file etc.
As it turns out, if I had moved out.. I would be paying the full load on child support. Since I stayed and she moved out on her own, we "fairly" (which is never fair) split the child support.