We sort of always knew, ever since Kindergarten, that we were more than one. We thought everyone was that way though. Even our dolls and stuffed animals had more than one name. And the core person would hear us talking sometimes. We also switched a lot... but I am not sure how to explain. Stuff that went WAY beyond mood swings or just feeling different. Also included losing time, people knowing us by different names, meeting a lot of people who knew us but we didn't know (they had been introduced to another inside person). We also hear each other and talk to each other. But, I am not sure if this is a very good reply, because we've always known and this is all we ever knew.However we were officially diagnosed about...hm... 10 years ago?after a whole bunch of testing with a psyche that took a couple of months. Definitely get yourself to a pdoc who can give you some tests.