I believe you can definitely have PTSD triggered by such an event. I was triggered by my father yelling at my son to stop crying when he was just a newborn, and he still does now, whenever I see him. So I try to stay away from him as much as possible. I wouldn't have him in my life or my son's life at all anymore if I could. I lost the forgiveness I once had for him. I'm not a professional, so this may not be good advice (and I may already have negative feelings about abusive fathers), but I would avoid your father like you have been. You don't need an abuser in your life. Life is short enough, why spend it unhappy? Don't think that you are wrong to ask your mom to leave your father, after all you are afraid of his violence and don't want your mother or sister hurt. Besides, he abused you. If your mother doesn't want to leave your father, talk to her on the phone or have her come out to lunch with you. Caring about your mother and sister being in the house of an abuser, can make your anxiety even more worse then just these memories are. I would say, that you will have to watch yourself. If you keep experiencing PTSD symptoms, you may have PTSD. When did it start and are you having anything other symptoms?