meditation brings up a lot of good and difficult things, it can reveal things from your history you were unaware of. people who have experienced trauma in the past can actually retraumatize themselves from practicing meditation. I myself have stopped meditating as of about one month ago, after some extensive meditation it was revealed to me in a dream that I suppressed the greif of my brothers passing for 20 years. i was traumatized by his death, and trauma can express itself in different ways, psychosis, bi polar, eating disorders etc.... i recommend what Buddhist teachers are teaching now, is that sometimes its not always good to be with your sensations because it can retraumatizing. i practiced 30 minutes of vipassana like a month a go, and the next morning i was totally numb, i couldnt feel sympathy, or anything. so i would recommend reading peter levines book in an unspoken voice, which deals with trauma and how symptoms can manifest and of the healing process. to heal my trauma gradually, i am planning on doing some ptsd based yoga, journaling, exercising etc... to chip away at the trauma before getting engrossed in vipassana again. i recommend tara brach talking about trauma on dharmaseed.org and other teachers on that site that talk about trauma. take care, befriend
take care of mindfulness, and mindfulness will take care of you.