Mild Concussion + body vibration normal?
 

Quick question,
I have had about four very mild concussions in my life.
The last two (about 8 years apart or so) upon getting knocked out I have a kind of mini seizure where I feel my whole body vibrate.

It is a very strong feeling and the other day when I walked into my wall in the dark (not smart I know but you can laugh) I felt very scared when it happened. I was fighting consciousness and I didn't actually pass all the way out because I was aware of what was happening. However, I did feel like I was dying. And I was paralyzed and I tried to talk but I just made a noise, I couldn't form words.

Anyways the incident was only a few seconds long, and no one observed it this time. My wife was in the next room and thought I was playing around.

I am fine now, no headaches 72 hours later. I also remember the whole event so I'm assuming it is very mild. I have had a less mild one before where I couldn't' remember what happened.

I tried googling this but didnt' really come up with concrete examples so I'm just wondering if this is a 'common' symptom of a concussion.

Thanks!