EMDR and emotional freedom technique helped me with some traumas. EMDR uses bilateral stimulation, so I do something like that for myself now.
I pace and toss a ball back and forth between my hands, I use a smooth myofascial release ball that is rubber so it has some weight. While I pace and toss the ball, I imagine how I would have handled the situation differently if I had had the power, the resources, the advance knowledge, a way to defend myself. And then I take back whatever inner resources I didn't have at the time of the trauma.
PTSD comes from having been powerless. Using this method has helped me get back a lot of my power. If you want to try it, don't push yourself and overdo it, the point is to release a little bit at a time, get back a little power at a time, not retraumatize yourself. You can just pace and toss the ball to calm, maybe another day do that and think about something calming, then another day think about just one small element of the trauma and surround it and fill it with power and capability. If you feel overwhelmed, you can stop, put your hand on your forehead, chest, and/or belly, do calm breathing, drink water, and be aware of your surroundings -- touch, sound, sight, smell. Maybe have something soft to touch, suck on some ice, put your bare feet on different surfaces and/or in water. Just give yourself time to be back in the present, back in your body, and safe.
In my mind, I have beaten up my mom, I have grown from little kid to taller than her and let her have it, I have pushed her, I have said no and held her off, etc. That's just one perpetrator. For each one, or each incident, I have created several different outcomes. I have way less flashbacks now, and they are no longer intense. Songs trigger me less, I am less afraid of people who resemble perpetrators, I feel stronger, I recover more quickly from triggers, I am able to stay more present through triggers and breathe and talk myself through them, I have more of my own power.
I also recommend taking a self-defense class, the yelling is awesome and re-empowering, and I recommend doing posture and core strengthening exercises.
Wishing all the best for you.