Two ways to stimulate your vagus nerve yourself, according to Dr. Tunis Hunt: (
http://drtunisjr.com)
"The first exercise is to gargle with water several times a day. The vagus nerve activates the muscles in the back of the throat that allow you to gargle. Gargle each sip until you finish the glass of water. You should gargle long enough and deep enough to make it a bit challenging (until it produces tears). Do this several times per day for several weeks.
Another method is with the gag reflex: Purchase a box of tongue depressors so you can stimulate your gag reflex throughout the day. Do not jab the back of your throat with tongue blade and hurt yourself, just lay the tongue depressor on the back of your tongue and push down to activate a gag reflex.
Gag reflexes are like doing push-ups for the vagus while gargling is like doing sprints. It will take some time using these exercises to strengthen vagal tone and the gut-brain axis. You need to perform them for several weeks to produce change." he says.
And another site promises 28 ways to stimulate your vagus nerve (I haven't read it all yet, it's long)
http://selfhacked.com/2015/07/30/28...agus-nerve-and-all-you-need-to-know-about-it/