This is a growing area of research now, on how trauma and emotional stress affect mental health. For anyone interested in this topic, The Body Keeps the Score by Bessel van der Kolk is a good resources. I also like the madinamerica website, which offers articles written by mental health practitioners who are critical of the chemical imbalance model of the brain (which was pushed by pharmaceutical companies https://www.newyorker.com/tech/annals-of-technology/the-psyc...).