>> We really have no idea how this stuff actually works. For all we know, your consciousness was in my body until a second ago.
Sorry but that doesn't make sense. By the same token you can start believing in supernatural creators- because, after all "we don't know how [physics] really works".
And yes, we do know some things. For instance, if something goes wrong with your brain, your conscious mind is also messed up. That's pretty solid knowledge there.
Besides you'll need to jump through some serious hoops before you can explain how my consciousness could be in your body without me knowing anything about it. Not that I'd put that beyond her, the little hussy!