In my case I had a lot of problems even opening my mouth to speak when questioned about the incident. Between the flashbacks, the nightmares and the reality of the situation it was all mixed up and still is to a certain extent.

My therapist (and i am extremely comfortable with her) really helped me out. I, when put in the situation where I have to verbalize openly will freeze.have a hard time getting the words out, zone out and I find myself singing in my head..........depersonalizing, I think.
I had to write the incident out as if i was in the room.like i walked over and he......Once I wrote it out and that was hard i had to put it on a little personal tape recorder and then i had to listen to it daily. i did this for a number of months and we would also listen to it togeether. Kind of like exposure therapy so that the memories were not so frightening. It is very hard but i found that my nightmares are less and the flashbacks although they still happen do not "take over" anymore. It was kind of like getting what was stuck in my memories out and not in my brain anymore.

You need to be ready and in a safe, secure situation. You need a good therapist hopefully someone trained in trauma therapy and also familiar with cognitive behaviour therapy to enable you to change the negative thought processes. It has helped me greatly but it is tough and the "it gets worse before it gets better" certainly fits here. For me I have improved greatly. Still have good and bad days but I think that is to expected.
Take care and good luck as you continue to heal.