You may already know these things but:
You may have been hurt, and you may have DID, but you are not crazy.
You found a way to survive. You are strong, and you are brave for choosing to talk about this as part of learning to be more-than-surviving.
For me, the way the memories stopped replaying was:
(1) There was a long time when I was constantly dissociated or reliving - I was never really in the present. When I got help, the reliving spiked. A lot. My T taught me: "It's real. It happened. But it is not now."
(2) I started to be able to feel the warning signs of a memory. For me, feeling emotions that have nothing to do with the current situation meant that a memory was coming. Even though I knew that, when it hit, I was still re-experiencing it like before.
(3) Eventually, I would notice myself feeling triggered and think "oh, come on. not this one again. I know how this one goes and I don't want to hear about it right now. It sucks and I'm busy." But I would still re-experience it like before.
(4) A particular memory would become more like a painful movie playing in the background of my life for about a week. After a while, that particular memory would lose power over me. It won't come up unless I think about it, and even then, it's a painful memory, rather than reliving. I know where I am, and I can choose to stop thinking about it and go think about (or do) something else.
(5) Repeat step 4 ad nauseum with a bunch of different memories.
In my experience...
There will be joy. The awareness of the past can become bearable and not central.
There are feelings and they are hard - grief, fear vulnerability - but grief helps with making some peace, and confronting fear makes us brave and teaches us self-care, and vulnerability helps with connecting with other people. And coping skills and stuff help with feeling hope. And in this way, bit by bit, we heal.