Tara Brach has an article on her website titled:
The Power of Radical Acceptance: Healing Trauma though the Integration of Buddhist Meditation and Psychotherapy. You can read it at: http://www.tarabrach.com/articles/trauma.html
Techniques described in the book Radical Acceptance can be adapted for cases where there are overwhelming feelings, but this must be done carefully, to avoid re-traumatizing the victim of trauma. This article describes how Tara used her method with one client.