For me it wasn't knowing what exactly would trigger the flashback and anxiety. Once we were just driving through a new housing development but the grass was still overgrown with paths coming out. It was like it was that day and I was back on that overgrown path on the ATV about to make the decision that would change my life. It was such a simple thing, I would never think being in a car would trigger that. The after effect of the anxiety was terrible. Luckily that was the last time it happened but it's the waiting for the next one that sucks.