Cat, I really suggest a physical separation. I don't think your H will be able to think clearly living at home with you. Nor do I think you can detach in a healthy way and live your life for YOU while your H goes through this mess. The separation will facilitate both of those things.
I know this is hard in the short term, but I belive it is your best chance at long-term success.
I'm sorry for the pain you're going through. I know this pain all too well.
Married 9 years Kids 5 and 6 Bomb 2006 H back and forth for a year M now back on track