Post traumatic stress

So now it is a week since the accident. I guess my car is salvageable with $9000 worth of damage it is off to the body shop for some R&R. Hopefully it will look as good as new when I get it back. As for me I still feel like I was hit by a truck. My back especially. I can't sleep at night because I can't seem to get comfortable for more than a few minutes at a time. And now when I am driving I stiffen up and my heart starts racing whenever I see a car approaching me from the rear. I can't believe how difficult this whole thing has been and I am afraid it has only just begun. Oh well this too shall pass.