I remember what I did right after the CSA, I went blank for a year. In looking back I can't remember that year after the event. I can remember the year before but not that year. After that year it's blurry and then three years later it becomes more clear. I know it got me feeling less or I should say I still have a hard time knowing what is going on with my body. I detatched from my inner self. I am not as good when it comes to knowing what is wrong or explaining my physical symptoms. It's like I lost myself.
I had the same experience. My abuse lasted three years, and until two years ago I couldn't remember anything about those years. I knew I'd been abused, but I minimized it. When I got slapped in the face two years ago with flashbacks, I saw what a nightmare those three years were. Interestingly, though, while I now remember the abuse of those three years, I still can't remember anything NOT related to the abuse (schoolteachers, friends, etc.). Like you, I remember things before and after, but, unless it's abuse-related, I have no memories of that three year period.
Also, I have lived with detachment my whole adult life. I have described it to people as feeling like I am inside a big space suit, being carried along by this body and this brain.