pizza.....one course of action that could bring this tortuous cohabitation to a speedy end, could be this. Go to your "lawyer in the stable"....file for divorce and pay the extra money to have him served immediately. If this causes him to blow a gasket (vey probable"....then. call the police and get an immediate restraining order. That will get him away from you, legally.
This would be playing hard ball. As you know, anyone who is diagnosed as narcissistic personality disorder means that one has to play hard ball....never give them an inch, and never, ever, let them see you sweat.