I used to have nightmares too when I was suffering from PTSD, sometimes 5 a night. It is a horrible feeling, luckly it stopped when the PTSD was cured.
My mother had recently threatened me and with an upcoming reunion coming up, I am afraid she might attend from out of state. So I am not going. The last either of me or my brother has seen her was when she put a gun to my brothers head , 2 days after Xmas when my dad died. So she is scary and my T says it is best to avoid her. She is dangerous. I just hate to be scared and I guess I won't get any peace from it until she is dead also. But at least I am not triggered into PTSD anymore. That is such a relief.