There are two types of flashbacks i did experience:

Flashback 1:

I don't know the trigger of this one, it just happens. I am feeling alert, and habe the feeling that right now right here something will happen and it is on me to stop this. But i can't figure out what it is. And it does not happen. The negative consequence is that i am disrupted in my thinking, i can't do work, i can't discuss with people because i get easily distracted. Actually i don't know if this is a flashback. I have it since i can remember. I don't know from which situation it could stem.

Flashback 2:

Trigger: A special kind of Haircut, maybe the headshape.
I get thrown back into the time when my best friend had cancer and i felt down, helpless, hopeless. When that happens i am socially disabled. The day is ****ed.