Mini Freak Out Today!

So not even six weeks ago I was in an accident that I have already described. I am still not healed physically, or mentally. Today messed me up mentally even more. While leaving the bank today my grandmother was backing out of her parking space when she and another car backed into each other, neither of them saw the other coming. When the two cars hit, all I saw was the car, from my previous accident, speeding towards me. I broke down crying, and started shaking all over. I do not know how much more I can take of this. Every time a car I am in comes close to another car I freak out, and today when the two hit I totally lost it. I need to get over this, and I do not know how!