These memories are no joy, that's for sure. But what's actually happening is that your mind is letting go of more of the information it has stored up from the time of the abuse. If it doesn't seem very coherent that's because trauma memories are stored in a part of the brain separate from where regular "historical" memories (e.g. what I had for dinner last night) are kept. They enter in fragments, unprocessed and with a lot of the sensory information still attached and quite raw. That's why they feel so real. And they hit us so suddenly because they can't be recalled on command, as it were, but rather are triggered. For example, the smell of a certain aftershave used to cause me a lot of trouble because it was used by the abuser; smelling it would set off memories that I didn't know I had.
The good news here is that all this is part of your healing, rough as it may be at the time. By recalling these memories we're writing them across to the part of the brain where we can actually work on them, as opposed to just get ambushed by them.
Hope this makes sense - it's a complicated topic and one that troubles a lot of survivors. The unexpected triggering and the raw sensory aspects make us feel like we're being victimized all over again.
Nobody living can ever stop me
As I go walking my freedom highway.
Nobody living can make me turn back:
This land was made for you and me. (Woody Guthrie)