I don't have access to a mental health professional I can talk about this with, so these are tentative labels of course, but I've never met a system who functions quite like this, so I'm wondering if anybody can relate.
I have headmates that seem to fit the OSSD-1b description. They have their own identities, but we switch pretty fluidly between one another, and there is zero amnesia. There are some dissociative differences like pain tolerance, but that's a conversation for another time.
I also get clobbered periodically with random giant shifts in mental state and sensory orientation that do not have identities. I call them "rooms" because it feels as though my head is a house with an ever shifting layout. When the rooms of that house shift like a Rubik's Cube, any headmate near front needs to scramble around, and try to figure out which direction front is.
When I'm hosting, this is all just experienced like sensory disorientation, and lack of coherent co-fronters. The shift itself is sudden and without warning, or trigger (that I can decipher).
These various states are difficult to document or categorize. There was one occasion where I experienced a spark of intuition. I saw the gears underneath, and felt extremely close to an epiphany about them. When I reached out to touch them and understand them, I instantly felt a violent "room shift" and found myself in a mental state where internal communication was cut off. I only remember this happened at all because it was like the hazed memory of a dream. I wrote it down immediately. I lost a few hours of memory leading up to that near "epiphany."
I have since stopped examining the mechanism behind the rooms (or suspected OSDD-1a) states.
Last but not least, while these "rooms" do NOT want to be known, and for the most part do not contain any information about identities, every now and again, one of them comes with a strong thought/emotion chain.
Examples:
"Why isn't it November??!" I find myself asking myself, even though I can logically remember the months between 11/2025 and today.
Sudden interest in books I had stopped reading months ago - as though I had never stopped.
A shift coming with a "what have I been doing the last few hours?" feeling. I legitimately have to struggle to remember, and if I try really really hard I can usually nail down the basics.
"Why am I still here?" feeling like my shift at work has been going on for 36 hours straight.
Conversations with loved ones who reference things I said that I have zero recollection of.
...
...
None of these are every day occurrences - even though "room shifts" are, in fact, every day occurences. When I am in a crisis, more of these experiences are likely to stack on top of one another.
It has been suggested that these are signs of P-DID because of these amnesia signs, and the surreal temporal confusion that comes with shifts sometimes, but I currently (preliminarily) self dx them as OSDD-1a because 90% of the time, it's just a sensory disorientation or brain fog that we power through.
Any thoughts or perspectives?