There have been a few times where I all of a sudden get very spacey and it feels like I'm leaving my body, like I'm about to pass out... Have any of you guys actually gone unconscious, without warning? I really can't tell if this thing I get is just an intense symptom which emulates the feeling of passing out, or if it's actually going to happen.

I have. I thought it was a seizure but my doctor tells me I blacked out. I didn't have a lot of feelings before hand though. I didn't know anything till the second it was about to happen and then when it was over. It wasn't a huge deal. I didn't fall or anything. best to you.

Yikes.. sorry to hear about that.. Were you doing anything when it happened? I've been told very mentally stimulating activities like video games can cause a seizure or probably something similar.

Yes, thats happened to me quite a few times. I wonder if its a moment of low blood pressure called "orthostatic hypotension" where when you go from laying to standing too quickly without letting your body adjust to the change in position. I feel very "spacey" like you so, extremely dizzy and immediately grab whatever is closest because ive gone down twice from it.

I was reading out loud. It was painful and made my head light up like a bon fire. The doctor said when I pushed through that feeling (becasue I kept reading outloud past that feeling), my brain just decided it couldn't do it and shut down. Like a reboot. I won't be doing that again so I think I'll be okay. : )

Seconds beforehand I got a feeling rising from my stomach to my head so if I feel that again, I will be sure to sit down.

According to the doctor all of this stuff is par for the course. She agrees it's all annoying and frustrating but normal.

I've had this happen a few times over the past three years. It is very scary though because there really is no/not much warning of this happening. My most recent one was a month ago yesterday. I remember walking in my bathroom, I got really bad vertigo out of nowhere and just remember grabbing for the towel rack. I ended up taking down the towel with me as I hit the floor and hit the back of my head again. I don't know how long I was out for, but when I came back around, I had my four year old sitting on top of me with the phone saying, "Mom you hit your head again. Are you okay?" Of course I ended up at the ER to get checked out, and had another concussion with a sprained neck. PCS can be so agravating sometimes!