The importance of the vagus nerve--and vagus nerve stimulation (VNS)--is often overlooked in the treatment of Anxiety and Depression. Yet, in the case of anxiety, when it remains untreated, patients often begin to compile a list of physical disorders, including autoimmune and gastrointestinal disorders, which are directly related to the vagus nerve.

Here are some articles that help explain the significance of the vagus nerve.

Role of the Vagus Nerve and VNS. 

VNS with PE Therapy  

Vagus Nerve Stimulation for Anxiety and Stress. 

This article briefly discusses electronic VNS, but there are also manual ways to stimulate the Vagus Nerve.