Where do you work? If possible I'd make it so I could work at the library or wander onto a large University campus/library and find a way to spend as much time away from the situation as possible.

I would also look into a part time work to boost my income, in a field that didn't require much interaction initially. Work delivering packages for a messenger service (or phone books, newspapers, etc.) or night desk work for example.

I would join some "easy" group where I could get to know other people some and get into a loop of information, if nothing else. Maybe take a course at a local community college or County site or join a toastmasters-like club or even go to a support group of some kind like they hold in hospitals and libraries. Something away from your family to focus on but without a really difficult participation level.

I'd also create a plan, like Doh mentions, for both emergencies (where womens shelters are located or YWCA or hostels or whatever) and as a plan to get out, maybe going so far as to open a "freedom" account and putting money away in that and knowing how much you want/need to get a place away and where you might want such place to be, etc.