Trailrunner, do you think you have 'multiple personalities'? Though I don't think it is referred to as that anymore, disasociative personality disorder is the current term I think? Sorry if I messed that up.
It's when there are 'others' that may sometimes take control of your mental function, often creating 'lost time'.
Do you feel this applies to you trailrunner?
Split personality disorder is yet another thing, it's when your personality represses normal emotions or behaviours (usually at a young age) and effectively locks them away. It's a coping mechanism, life doesn't seem so terrible if, let's say, your real opinion of your abusive mother is hidden from your conscious thought.
So, in order to find 'you' you must find all those locked away bits and reincorporate them.
That is something my therapist and I are working on.