...a bit. Or simple enough, if you don't think on the...finer points of it all working.
I died, and then I got erased from existence when I got sucked into a crack of all of time exploding slowly. Time machines shouldn't explode, they do bad things. Amy's got a bit of a special head though and a bunch of aliens against the Doctor read her mind for a trap and somehow got...me along with it when they made a bunch of duplicates. I was in her subconscious, it's how she remembers me later.
Definitely me though. Still survive the Nestene ceasing to exist with most everything else in the universe in the first memory. None of the other duplicates did and I was fighting against another personality, so I'm the Rory Williams she remembers.
[...Amy is kind of why he exists. Maybe that helps you understand his freak out? =|a]