Though, Its rare phenomena and hasn’t happened in years now.
I used to “Blur out” sometimes where my vision turns blurry and the voices around me become muffled, and unlike spacing out, i am very aware of what’s happening around me / to me.
I usually can snap out of if i want to, by Shaking my head, but its odd because i find very draining to muster the willpower to Shaking my head, feeling very tired
When i was 6, i hit the back of my head against the side of my parents bed. I was jumping on the bed and fell and had to get stitches. Maybe that is the cause of my blurring out?
The standing up thing is called orthostatic hypotension, and flexing your quads is a bit more effective than your abs to fix it.
I don’t get the standing up too fast “blackout” a lot , just sometimes. We always called it a freebie. I thought it was normal.