First let me say that I have no experience with DID, nor am I a mental health professional. What you are describing is what depersonalization and derealization feels like to me. I don't recognize myself in the mirror, I'm not connected to what I am saying or doing, yet I am aware of my words and actions. It's just from a distance, but I do not feel like I am in control of it. But it is definitely me. I often don't quite remember conversations, not from the effects of any sort of amnesia or alter, but sort of how you don't always remember everything you see in a movie - even if you're watching it, you're not really feeling the full experience of it and some details slip through the cracks. At least that's how it works for me. This may very well be separate from the times you do switch, and is simply another way your mind dissociates from things.