I suffer the same way. I was also the victim of a random violent attack at age 14, and at 34, if I step out of the house for like a minute, I have to search every room and say menacing things outloud in case "someone" is there to get me. I walk outside and take a pen and a ciggarette for defense when I must go outside at all. If I have to drive, I feel like I'm being followed, so I stop a grocery for 5 minutes, then leave and see if there are any cars following me from there to my home.
When I see young girls walking alone, I become overwhelmed with dread. I write a description of them and where they were walking and at what time, in case someone goes missing, I live near to a public place where kids sometimes play, and every scream day or night goes checked. If I go to the laundry and I see shady men who "menace" me, I write all their info, plate #'s and I've told my husband of a hiding place in the car where he can find it, just in case. Also, if I leave the house, I leave a detailed list of what it is I'm wearing from clothes to undergarments to jewlery to footwear, again, just in case.
It's so hard to shake that paranoia, especially when we are told that the type of crime done to us is "only a tiny percentile of crime out there". That's what Jamie Floyd (from Court TV) told me when I emailed her during the Carlie Brucia case, when I pointed out that that small percentile seemed to happen a lot, Ms. Floyd informed my it was the media sensationalizing Stranger Danger.
I do ramble, I apologise. I have found that if I can try to distract my mind with puzzles like crosswords or Sudoku, I can practice focus on the rational part of my brain. When I do that, I do breathing exercises if I find it hard to focus. I also had to stay away from Court TV, all the crime documentaries (I'm a huge crime buff, and i have a certification as a Criminal Profiler), as well as to stay away from the news for a bit. It was hard for me, but in the long run, I'm able to watch what I want know almost trigger free.

I hope this is helpful in some way, at least to let you know you're not alone.