I do have PTSD.... Something happened that blew me away... could you guys tell me what you think?

Years ago, maybe 20 I was hit by a pick-up truck while I was crossing the street. I was crossing as I should, with the WALK light.
The pickup truck was doing right turn on red light and smacked into me. I flew under his truck. He had to back up so I could get out. I had bruises, scraps and spained ankle.
I went into shock and he drove off.

Fast forward 20 years. I was walking across busy intersection with "WALK" light, slipped and fell. Didn't really hurt myself but couldn't seem to get up. I crawled from middle of intersction to sidewalk. Cars were waiting for me to get out of way. Though I wasn't hurt, I was in shock. The firemen had to help me to bring me out of shock - this took a long time.

So is this "shock" a result of PTSD? I wasn't thinking of th
e truck accident of years ago. during the fall or after. I was just was non-responsive, couldn't walk, my body temp. went way down and for a long time I was incoherent.
The fall during the walk I think was worse for me than the truck accident.

Is this some kinda weird flashback?

Would really like your opinions....

Hugs to all, freewill