Do I have PTSD (Post Traumatic Stress Disorder) ? NEED HELP?

When I was about 8 years old or so, my mother and father got into a huge argument. I'm not sure if he was drunk or not but my mother tried to hide from him in my room and she was crying and he came and beat her right in front of me, she was screaming and bleeding everywhere and started saying that it was my fault this happened. Before this huge argument the argued many times before and I always heard crashing against my wall. Now I'm 13 and sometimes I get flashbacks of that time. Usually the thing that triggers me is a certain song, seeing blood, or having someone in a certain situation like that. I start to cry and begin having a panic attack, breathing irregularly and repeating "It's my fault. It's all my fault." I have been wondering if this is a medical condition and whether I should seek help or not. But does it sound like or do I really have PTSD? I really need help because I almost had a panic attack today.