Is it normal to feel scared when you're alone outside after experiencing a physical attack?

Last night around 10pm I got off work and went to McDonald's to get a drink before I headed home. In the parking lot is stop signs. And I drive for a living so I'm use to making complete stops at stop signs. So I stopped at the first stop sign and turned right. I did notice the vehicle behind me really close to me. After making a right there was another immediate stop sign I made a complete stop again before turning right. Next thing I see is the vehicle that was behind me on the side ahead of me and cut me off. I braked but it wasn't enough time so I crashed into him.

It wasn't bad enough of a crash to where the air bags deployed thankfully. But I sat there in shock because it was one lane. What the man did was completely illegal making this crash his fault. But clearly he didn't think so because he jumped out of his car, ran to my window which unfortunately was down, and he started punching me with his fist.

He was hitting me so fast I couldn't think other than raising my arm to block him from hitting my head. After hitting me around 7 times he stopped. And on his way running to his car he yelled, "you hit my car!" He then took off. I managed to pull myself together enough to get his plate number. And thankfully a biker, who was my angle that night, got over to me as quickly as possible and stayed to tell the police what he witnessed. I didn't notice the make and model. But the biker did. So police have a good lead into identifying my attacker.

I'm thankful to be ok. My arm had clear swelling and bruising that police documented. My issue is more mental. I now feel scared I'm going to be attacked when I'm alone outside. I start feeling anxious and the need to quickly look around me to make sure nothing is coming. I'm hoping it's normal and it will go away. Is this normal?
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Thanks all. I should have recognized they symptoms of ptsd as I dealt with it years ago after I fought a pit bull to let go of my sons head. So it must be ptsd but I'll talk to someone if it interferes to much with my everyday life.
Is it normal to feel scared when you're alone outside after experiencing a physical attack?
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