OK, I'm going to have a go at answering your question. I think that you should focus on getting through the flashbacks when they do happen, by trying to ground yourself (holding on to a pillow, physically sitting on the ground) and get through them. That, or try to stay in a safe place, somewhere where you feel comfortable and secure.
Have a look at
http://www.mental-health-matters.com....php?artID=154 ? I don't know of how much use it will be to you, it came up on google when I had a nosey.
I also suggest contacting
http://www.samaritans.org.uk/ Samaritans or a rape crisis
http://www.rapecrisis.org.uk/.
Stay safe and take care.
xo