This has happened on and off for some years, maybe only once or twice a year. But this morning it happened again for the second time in a couple of weeks.
I was perfectly relaxed, not even out of bed - sitting up watching birds through window - suddenly the feeling hit me.  You know when you bang your funny bone, you get that vibration down your arm? Well it is the same feeling, at base of my skull - not just a dizzy feeling, an actual physical vibration that lasts about 5 -10 seconds. Absolutely horrible. No pain, I didn't twist or move oddly, just comes completely out of the blue. It affects me for ages afterwards because I am wondering if it will happen again and it's really scary. Does anyone relate to this? It's really bothering me, I'm noticing every tiny feeling in my head and I can't speak to the doctor about it till tomorrow.  Would love to hear from anyone who can help.