Complex PTSD: From Surviving to Thriving Book by Pete Walker
This book is a great place to start. I'm struggling to finish it because it's so relevant that reading about it is quite an intense experience. I'm also currently reading Buddha's Brain by Rick Hanson. It's a neuroscience book which goes through all the biological processes that our brains go through when we experience symptoms. It's oddly calming to read about the actual physiology behind my experiences. It also gives meditation tips and breathing techniques that help with flashbacks.
Another book that's been recommended to me but I haven't stated yet is The Body Keeps the Score by Bessel van der Kolk.
I find that reading about this stuff creates quite a lot of anxiety so I'm pacing myself. But I feel like the anxiety means I'm going in the right direction.
Bad enough that I cannot handle music with lyrics, with a few exceptions. Genres like post-rock are all I listen to.