The vagus nerve is your major stress-mediating pathway. It is your pleasure avenue, your “grace under pressure” nerve.
Trauma, both physical and emotional, shuts down the vagus nerve. It gets stuck, pinched, compressed. The vagus nerve is itself, also gets traumatized. In trauma, it loses the ability to fire, to mediate pleasure, inflammation, digestion, and more. 
Come learn more about the vagus nerve and exercises to decompress it so you can have more access to a pleasureful, pain-free life!