Im a teen and i don't remember my childhood. i only remember a tiny bit of information that was by video or photos or a tiny bit of memory. but there is this one big event i remember. i banged the back of my head (when i was younger ) and i think i blacked out. then the next thing i remember is bleeding through my mouth then blacking out again.help me please.is this serious or normal.did the bang to my head affect my memory as a child.