It is quite common for the human who has been traumatized in childhood to experience these flashbacks in adult life. The volatile material has been repressed successfully over the years, but now the images and other content force themselves upon the waking mind. The Reality Creation is disrupted violently during these events, as the human, usually referred to as “the victim,” re-experiences the Feeling-Tone of the Traumatic event or events.
It seems to me, that what must change here is the felt sense or Feeling-Tone of the traumatic past that comes to visit. One then revisits the traumatic memories in the Trance State, with an eye toward altering them; altering in memory and thus altering the effects in the flashbacks. One observes the traumatic material as an Objective Observer, without becoming emotionally involved, you see, as though one were watching a movie. Important information is carried out of the Trance State and then documented. Each time the scene is revisited in memory, the Objective Observer notes the particulars with cool detachment. Eventually the flashbacks will be experienced in this Observer Perspective, rather than the traumatized “victim” perspective. It is a case of tuning down the high emotionality and trauma of the event. The cascade of negative emotion will be prevented, as the disturbing material is observed in the cool light of day, you might say. Again, this is simply a change of perspective and so change of realities.