I am sorry this is happening and apparently often enough to be triggering your Ptsd that your mother caused. I don't know how you get rid of that, I haven't managed to and my crappy mother has been dead for years! You have a similar situation to road rage I would think and man sometimes THAT is really hard to not act on.
A JERK passed everyone on the right the other day and I honked he flipped me off and I would have given anything to have been able to shoot his tires out. But no that would just get me in trouble!

Big hug and hang in there.