There are several agencies who can advise women about immigration and financial issues with relation to domestic violence (see the bottom of this page). You should definitely seek specialist legal advice about your rights and options.

There's been an important development with regard to the rights of women who have been married to a British person for less than the required time necessary to gain leave to settle in the UK but who need to leave their husbands due to domestic violence

Complete story at the BBC site: http://www.bbc.co.uk/health/hh/practical11.shtml