I have no idea if what you both are experiencing is L'hermittes sign or not, but I have had this off and on for 6 years now.
My L'hermittes, when I am bothered by it, really only happens when I tilt my head down even a little. I get an almost sickening feeling throughout my body as this "electric shock" goes down my spine and seems to exit out my arms and legs. Let's just say for the days that I have this, I do not look towards my feet. And for me, it really does go on for days not minutes or seconds.
The only time that I have ever buzzed was after IV Steroids. I felt as if a million bees had decided to take up residency throughout my entire body.
This probably has not helped either one of you, but I wanted to share as this was something else to support my MS diagnosis - this symptom among many other things.
Take care. I wish that I had some advice to make it stop.
Mommy of two incredible little boys (4&2)
Diagnosed RRMS - February 2000
Tysabri, Provigil 200mg, Lexapro 10mg