Here are just a few of my favorite self-help/emotion regulation type books. You can find many of them at the library or local bookstore:
The Body Keeps the Score: Brain, Mind, and Body in the Healing of Trauma by Bessel van der Kolk M.D.
Feel the Fear and Do It Anyway: Dynamic Techniques for Turning Fear, Indecision, and Anger into Power, Action, and Love by Susan Jeffers PhD
Radical Honesty: How to Transform Your Life by Telling the Truth by Brad Blanton
Atlas of the Heart: Mapping Meaningful Connection and the Language of Human Experience by Brené Brown
The Untethered Soul: The Journey Beyond Yourself by Michael A. Singer
Set Boundaries, Find Peace: A Guide to Reclaiming Yourself by Nedra Glover Tawwab
A Mind at Home with Itself: How Asking Four Questions Can Free Your Mind, Open Your Heart, and Turn Your World Around by Byron Katie