I have the exact same problem as you with letting go. I dwell on things for years. I just recently posted a forum about issues with my mother, I just can't let go of the wrong that was done to me. It takes over our life and consumes us, it's unnecessary stress, and we know it is. I've tried thru therapy thru the years and I still haven't figured it out. It makes me miserable, and I don't want to be, I want to live a happy life. I hope someone can offer some advice because I also need help with this.