This is like my 2958028935th post to older posts that nobody may be reading anymore, but it's all so interesting and I must share...
So. Yeah, I get that vibrating in my head. I've had it get so intense suddenly it dropped me to the ground. The last time was the first really hot day we had this spring. I was fine til i went outside in the heat for all of 2 minutes. I had just been all through an air conditioned grocery store and then went back out, trekked across the lot to the car, and the buzz took over my head and I started to feel myself "float", basically ended up draped over the hood of the car.
Once I completely 'lost my body' when it really took over. The buzzing just started and got very intense, and then woosh....could not sense my body one bit. No change in consciousness, just couldn't see, hear, and had no sense of my body, I was suddenly a ghost in space. But I knew what was happening and where I was....very odd. I didn't lose time or feel like I had been unconscious or asleep or anything. Just lost myself completely except for my thoughts.
Vision and hearing and feeling in my body was back in under a minute and here I was laying in a giant palm tree planter that I'd apparently toppled over into, with people staring at me lol Got up and walked away like nothing had happened, meaning, felt just like I had right before it hit. (which was fairly good, that day). This was on vacation in Hawaii. 2nd day there. I had been waiting outside while my friend ran into a really crowded store I decided to avoid. She missed the whole thing and hardly believed it, it was all that quick.
1st few days on every vacation/trip I've EVER taken to a warmer climate, headaches hit soon as I'm off the plane and into the heat. That's interesting to me. And most of these hit in sudden heat - hot room, heat waves, etc. Interestingly, so do most of my headaches.
They usually feel like they start in the back 'chunk' of my head or back half I guess, and then spread to take over my whole head sometimes. Sometimes if it tries to take my body out I feel it sorta 'trickle' down my spine and get the buzz feeling extra 'vibraty' in the base of my skull, but usually it subsides before I actually start to lose my body, or after a split second of feeling like I shrunk an inch or two. The vast majority of the time, it's a few seconds of the buzzing and nothing else happens. Rarely is it happening right alongside headaches but before or after. Mostly after, like next day, after Ive felt normal for a little while.
I don't get it at night really, unlike you. It HAS happened and it is disturbing to sleep, and when it does finally happen at night it seems to be every night for a few in a row, but that's very rare for me.
I've had severe headaches which resemble, and have not been officially diagnosed as cluster headaches, since I was 7, so if my nerves got "frayed" I guess they had plenty of time to get that way, but it sounds like a pretty shoddy description of what is going on. Anyway if anyone learns anything more about this I would be fascinated to hear more.

EDIT: I just wanted to clarify (if it didn't seem apparent) that I don't get the buzzing IN my body. Always just the buzz in my head. But that sometimes it suddenly leads to me losing all sense of my entire body if it's particularly intense. But most of the time I just get what you described. And also, if anyone else finds their buzzing sometimes causes this, I am curious to hear about it.