Non-invasive vagus nerve stimulation (nVNS) is covered by the VA and is an alternative to prescription medication. Author: Bary Roy Updated: 6:30 PM CDT June 30, 2021 TEMPLE, Texas — Editor's Note: The video above is from October 2019 Migraine and other headache disorders can take a toll on everyone, especially veterans, both physically and emotionally. Migraines and cluster headaches can have a negative impact on personal and professional relationships as well. Dr. Peter Staats, is the Chief Medical Officer of electroCore, a medical device company that makes gammaCore, a hand-held device that stimulates the vegus nerve through a therapy called non-invasive vagus nerve stimulation (nVNS).