Meditation and talking with a meditation instructor might help. You could find a meditation center, but also request one-on-one instruction from a certified instructor, and this is usually offered at (Buddhist) meditation centers for free. You don't have to become Buddhist. The thing about this is that any certified instructor who is authentic will be willing to discuss your trauma with you, as Buddhism teaches one to "lean into" painful stuff rather than ignoring it. The Buddhist nun Pema Chodron has written some good books on this. But if you want to do meditation for purely secular reasons then insist on it. Don't let anyone tell you that you need to study Buddhism in order to become a meditator. It isn't true. In general, however, Buddhist meditators have absolutely no problem discussing trauma and working with trauma. Good luck.