You read my mind.
Anyone's guess is as good as mine, but that's generally where my mind is in terms of what we are with respect to reality. You used the multiple personalities example, so I'll ask that you consider another example I like to use often, which is that of a dream. A dream operates as it's own reality. It has it's own particular set of rules and vividness that you can actively control if you are aware of them. The dream characters inside are no more than an expression of yourself, your own mind, all divided and spread out into different people/things. Given enough time, these dream characters would soon come to theorize that the dream world they exist within is just an illusion (as well you know it is), and some will go so far as to suggest that they are a part of the same mind (which is collectively your mind).
With respect to dreams, the only thing that exists in actuality is consciousness (and perhaps the brain, which intelligently processes the information). All of the 'reality' that becomes the dream comes as a result of your consciousness. The real world that both you and I experience day to day is analogous to the dreamworld in the way I just described. Nothing more than a convincing illusion that we use to interact with each other ("a collective consciousness experiencing itself"). I'm sure this probably sounds outlandish to a great deal of people, but if you'd like me to clarify my point of view on this, I'd be happy to do so.
As for the origin? Who knows? Existence by itself appears to be a sort of paradox on its own, but here we are. The existence we experience implies that there be some source or point of entry, and I wouldn't be surprised if that 'source' was the consciousness we are all theoretically a part of.
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