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?