Grounding skills are most important. Things that force you to be in the present. Utilizing all 5 senses that connect you to TODAY. And use stuff that is self soothing. There was a thread a while back about like a crisis survival kit, it's similar to that. Finding stuff that provokes POSITIVE responses from you, connect you to positive influences, and of course is in the present.

Identify 10 things in the room that are blue. 10 things that are soft. 10 things that may smell good. 10 sensations in your body. Even looking through psych central that has 10 posts that are about positive interactions.

Take deep breaths, and tell yourself "I am ok, I will get through this, I am in my ____ room, doing ____, sitting on ____, etc"

I think it's important to acknowledge that you are having flashbacks, but the most important thing is to then move past that and put focus elsewhere.