No, you're not cuckoo. It sounds like very real triggering and a PTSD type of reaction to a trauma. Our brains get really messed up when it happens... files memories in the wrong place, and it it's attempts to find a good spot for them, cause all sorts of triggering and reactions to connected data (and then also mis-filing those incidences.)

Can you tell what is causing the triggering? Anniversary of the injury? Reacquaintance of someone else involved? Driving past the area?

PTSD makes you feel like you're crazy. My T doesn't want me using that term, as it isn't me... it's the nature of the "beast" of PTSD>...