If it will help, I can share what happened with me. I'm in no way saying that it's the same as your experience...maybe similar...

I was dx's about 5 years ago with DID. T and I have come a long way with understanding others inside and who and why they are. One of mine is a teenage girl who can be volatile. At one time, last year I was inpatient in order to deal with upcoming cancer surgery. It had been established that this "other'" had no knowledge of my father's death a few years earlier. Anyway...I got a phone call from my husband who gave me some bad news (job loss) and suddenly I "felt
, "heard" and "saw" an explosion in my head. There was no pain but I did hit the floor pretty hard. Afterwards it seems I was very dissociated and hysterical about the death of my father. Somehow, the bad news from husband and my father's death, merged and the teenager inside "found out" about the loss of the father. The DOC was called but all she could focus on was the fact that "I felt an explosion in my head"...she was thinking seizure, stroke all the bad stuff. I knew it wasn't physicaly serious but when I tried to explain, I got nowhere. Basicaly, she laughed in my face.
What I'm trying to say is maybe this has something to do with others inside , knowing or realising something and reacting to it.
I hope this was not too confusing as my explaination is still heavy with emotion.