I am so sorry that this happend to you. Nobody deserves to be treated like you were!
I do know what it's like to have a gun put to your head. It happend to me. It wasn't a D.V. situation, though.
A good therapist can give you tips on how to cope with the anxiety that comes with these memories.
Another thing that you can do is to remind yourself that that was then and this is now. It does help somewhat.