Ptsd or just paranoid?

There was a shooting a few nights ago in front of my house and I was on my way out to see a friend when something told me to go grab something inside so I turned my car on and went back inside and came out again after 10 seconds and saw a car slow down and start shooting across the street. I got down and ran inside to tell my family to get down. I’ve experienced a lot of childhood trauma and certain loud noises do trigger me and put me in an uneasy state but ever since that night I feel like I’ve been a lot more anxious and paranoid lately. I feel that if I wouldn’t of made that last minute decision I would have been caught in the middle of it. I can’t help but to look over my shoulder and everytime I see a car like the one I saw that night, I can’t help but to feel like running or hiding. I don’t know what’s going on with me. I was having some regular life issues before this but nothing that has made me feel like this. What’s happening to me? Is this normal?