!!!! - i had this so badly that i went to my gp about it. around ten years or so ago i bumped a kerb with the back wheel of my car while parking and convinced myself i’d hit a cyclist (why a cyclist who knows?
) to the point that i was checking local news etc to see if anyone had reported anything.
it’s actually a form of ocd (called “hit and run ocd”) and effects a lot of people, if that gives you any reassurance
i’ve gotten better with it, and with controlling the intrusive thoughts side of my ocd, over time but it sometimes still crops up.