Hi Squeak,
I agree with Grama-Herc - shutting down is the brains way of dealing with trauma and protecting you.
I was terrorised by my boss for two years. He had a multiple personality disorder and decided I was a terrorist so he tortured me. He was drugging me with his medication (including sleeping medication), threating me with a letter opener, sexually harrassing me, putting pubic hair in my coffee, stole my underwear from my suitcase, tipped a cup full of pee all over me/ my desk/ the floor, psychological abused me constantly etc.
At the time, I tried to talk to my family and partner about it, but (because of their own issues) they were impossible to talk to, just judged me instead of listening and encouraging me to talk. So I shut down, didn't believe it and tried to carry on - and tried to be a better employee because according to my 'support' network this was happening because I was a bad employee. I recall trying to tell his boss, HR and the Union, and was called crazy and paranoid at the time. So again I thought I had the problem not him, dismissed it and tried to be a better employee...
His boss and HR knew by the way that he had a multiple personality disorder. But that's another story.
I was tortured for 2 years by him and I kept dismissing (as a crazy thought) and forgetting what he was doing to me. Partly because he was drugging me, partly because my brain dismissed it and partly because my 'support' network was dismissing it.
For years after the torturous 2 years I didn't remember it, I just remembered that my boss was not very nice. I couldn't place why he was a bad boss, I just knew he was bad. I went on had a career and was very successful, was in a long term relationship, moved countries, still nothing... But then I was confronted with psychological abuse again and life became tough, I kept telling my partner that I couldn't handle the psychological abuse because of my old boss. But I could not describe what my old boss did, I couldn't remember the details, just that it was really bad.
Then, I was getting on with my life, doing more study and getting great grades, then BANG! it hit me and I remembered everything with heightened emotion, not times but key events. I believe that not only was my brain trying to protect me, but the dismissal by others also made me internalize what was going on and stopped me from talking and making sense of it.
I sometimes wish I did not remember it at all, I would have been much happier not knowing. But, the moral to the story, you may not remember parts or all of what happened, but the important thing is to understand how it all made you feel at the time. The way it made you feel is the thing that needs to be worked to begin the process of recovery, not specific dates, times, or even events.
Take care of you,