Here are a few more resources to better understand how unresolved trauma affects the body:

https://www.psychologytoday.com/us/blog/somatic-psychology/201004/the-connections-between-emotional-stress-trauma-and-physical-pain

http://themindunleashed.com/2014/04/effects-negative-emotions-health.html

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3896150/?log$=activity