I've just realized that I may also have PTSD. OMG!

I was hit with anything that my mother could get her hands on. One day after school, I came home with a bad grade and she backhanded me, I lurched backward, and right down the basement stairs, I remember falling, I remember the fright, then the cement floor and the blood pouring out of my mouth and nose. My father bending over me, cradling me and just crying. Why didn't he try to stop her? He never stopped her from doing anything. He still doesn't. He's in his 80's and he's still allowing her to do anything that she wants to do, he doesn't even call me.

He says now that he never knew most of the things that my mother was doing to me, then why when he did finally find out, didn't he do something about it, talk to her about it, of course she would deny it, but still. I was so terrified of her, and still am, and I'm 52, she can't hurt me anymore, or can she?