I find that what works best is to develop mindfulness skills. The first of which is learning to meditate on your emotions and memories, to develop independence and break free from the habit of becoming overwhelmed by your emotional reactions. The second mindfulness approach that my students really benefit from is image reprocessing - consciously changing the properties of the internal traumatic images themselves. This is essential.
I don't like "treatment approaches" because they don't give you the skills for doing this.

The Boulder Center for Online Mindfulness Therapy