I have a nice little TENS unit I bought on Amazon last year when I was undergoing physical therapy for my lower back. I knew it wouldn't be anything like the large, expensive TENS unit my therapist used. It's about the size of a small smart phone, really light weight and comes with it's own cords and stick on pads.
The first time I used it, I was so surprised how intense the stimulation could get. It offers a menu of icons for the different types of massage. I found the one just like my therapist used, and that's what I generally use, or I go down the icons and do a little of them all. It really "grabs" the muscles, just like a massage, and the upper area where I use it moves about so much that my shoulders shake.
I tried the Medicare route, but it was such a hassle because the doctor who treats my fibro is SO hard to get the proper documentation from. I think I paid about $30 for this little unit. I don't know about putting it on my ear area though.
The .pdf document that Cort put in the Forum section showing how to use the "auricular" attachment and how to prepare the TENS pad by actually exposing the wires and then putting them inside that attachment aren't possible with my unit.
But if breathing also works, I'll definitely do that! I've used Dr. Weil's breathing method since I first read about it years ago, but only now and then. Now I will try and do it regularly everyday, and especially when I have my vagus nerve symptoms, and see if does indeed help.
This whole area of research relates to all of my most major symptoms: tachycardia, neurally mediated hypotension syndrome (NMH), vaso-vagal responses from irritable bowel that include: dizziness/vertigo, sweating, tachycardia, fatigue.
Now I understand better why Ashok Gupta's Amygdala Retraining Program works for so many people because the entire underlying focus is on shrinking the amygdala and thereby significantly reducing many of the core CFS/ME symptoms.
The "map" he uses and the script that you say out loud that goes with it, if done like he recommends, simply redirects the mind every single time you have a thought or concern about your body or you're focusing on symptoms. He also uses a specific alternate nostril breathing method and encourages meditation and other techniques.
I'm so BAD! My partner invested in Gupta's program for me a long time ago, and I used it for about a week, if that long, and just stopped because I'm SO undisciplined! :-( I want someone ELSE to fix me. LOL!!