It is not impossible...

that a variety of circumstances could conspire to create a new and strange incidence of something else. And all the little unspoken rules that conspired to keep something as whatever it was could be forgotten and then come back to you and arrange themselves into new and strange forms. And this goes on daily. Under a multitude of roofs and skies and in the name of millions of varieties of religions.
Some "memories" come back and they could be stories and perhaps not provable facts, and yet these stories could be the fruits of a portion of reality that once was, which for some reason has come flooding back into your present, and has wormed itself strangely into your brain, is turning into something else in your heart or psyche, and is part of a remembering of what you once were and then you take that and another self is born out of that.