I wish I couldn't relate to this as much as I do.
I'm so sorry you're going through this right now, flashbacks can be incredibly painful to get through and I wish I knew how to cope with them so I had advice for you.. :/
My big suggestion would be to go get some love from your animals. Whenever my night terrors got bad I would go find my cat & snuggle up to her/cry in her fur. When I cried hard it scared her sometimes but it felt so good to just get it out, especially with someone I loved