I can't mediate because of what comes up. I've spent so much time in my life trying to dissociate from my experiences that I can't handle being flooded with them. There's information and studies out there about the difficulty of mindfulness for trauma survivors with dissociative symptoms. It doesn't necessarily bring up trauma memories or forgotten memories, but it allows you to be present in your body and forces you to pay attention to stuff you may have been expending energy on avoiding.