Thanks for the reference to my free ebooks on my Chronic Illness and Trauma Studies blog Melissa - They all focus on trauma although none of them go into deep specifics of physiology / hormones.
I do have a list of my favorite books on trauma that I find relevant to chronic illness, although most don't specifically address the question of trauma and physiology either. The list can be downloaded for free.
Another possible source is Dr. Robert Naviaux' free journal articles on the Cell Danger Response (CDR), which is a nice way to think about the effects of trauma at the mitochondrial level. I have a blog post on the CDR and links to his articles, such as this one from 2018.
Hope that helps!