This sounds more like rage to me. I get that too specially driving! I have chased down people and have been chased. Usually it's just a game for me, the adrenaline flowing, excitement, the risk factor is all exciting for me. Some people play along and that is cool. But some times I run in to people like your punk friend and it turns ugly fast like your incident did. I think what ticked you off the most was his smart @ss look and way he acted. I don't really see paranoia here as the main driver. Anger certainly was tho. And look, don't get me wrong, I been there and done that too.

The looking over your shoulder that part was paranoia. The rest is just rage and or anger I think. May have some thing to do with your pdsd. My road rage is because I get off that way in a big way.