I have orthostatic hypotension, which doesn't affect me as much since I've gained weight, and I've lost consciousness from standing to quickly up, but sometimes it doesn't all go away. I black out, a moment later I am somewhere, I don't know who I am or where I am, a moment later the rest fills in.
The way I understand it as the blood pressure drops your brain stops to function properly but it might still somewhat function. As blood pressure goes back up more parts of the brain resume normal function but the "functional" state of the brain might still be abnormal. The current state is unstable, especially when new functionality starts to come back online and resume normal behavior, and the state of the brain quickly moves from a unstable state to a more stable normal state.
Yup. I have this too and have had similar experiences, but they've only lasted a couple seconds. I wasn't able to get a detailed picture like OP was describing.
The way I understand it as the blood pressure drops your brain stops to function properly but it might still somewhat function. As blood pressure goes back up more parts of the brain resume normal function but the "functional" state of the brain might still be abnormal. The current state is unstable, especially when new functionality starts to come back online and resume normal behavior, and the state of the brain quickly moves from a unstable state to a more stable normal state.