To the OP it seems as if you are stuck in a cycle of trauma, whereby you continually relive the traumatic events. This is what is causing the underlying depression. I suggest you look into the work of Peter Levine who has developed a therapy called Somatic experiencing for this purpose. It is a body based therapy where the premise is that the body has an inate ability to heal itself. However at times we get stuck between fright or flight and literally cannot move on from the source of trauma. Somatic experiencing allows you to develp a felt sense of the trauma without perpetually focussing on the actual memories of the trauma thereby dispersing the trapped energy.