As clearing the abuse involved different layers, every repetitive nightmare had its own needs, in order to release it. It took skill and patience (sometimes years). But remember, you can do it! If you choose to do what I did, please choose to work with highly trained professionals, because releasing anger is different than re-traumatizing yourself. It can be a fine line. Professionals can help you, avoid self-injury.
When nightmares were repetitive, and were not helped by relaxation, meditation, or general talk therapy, I found working with my voice (Llinklater Technique), my dreams, my anger, or taking Model Mugging ( a unique self-defense class), or having deep tissue work, helpful. Moving the emotions, through and out the body, helped free me from freeze, flight, or fright mode, and move me into a new equilibrium.
Examine your nightmare, understand what your fear is, and what you can't do-in the nightmare. Then, find a way to safely explore that need, and to develop the related skill, in real life. It may take some experimenting and the insight of a therapist.
Many therapists are afraid of their own anger, so be prepared to hunt and get referrals. Also, be prepared to find one who is skillful, and helos you error on the side of safety.