I was attacked

I m16 was jumped by around 15 people, it was unprovoked and seems like some initiation of a younger kid into a gang. I had a life and slingshot with a big metal baring pulled on me. I just keep getting flashbacks of that baring being pointed at my face and it barely missing my face. I managed to fight back maybe layed out 5 people (yay kickboxing training I had when I was younger) but I got pretty messed up, and currently am still concussed 2 weeks later after vomiting blood daily for a while. Idk Is it even possible this is ptsd, but whenever certain things happen I get extremely panicked, I can’t even go outside normally at the moment.