Double Trouble

A man wakes up on a train. He wakes up as a different man than he remembers.
It is not his second self (the one of the past five years) that he remembers, but his first self.
That makes things difficult, since everyone else he comes in contact with, knows him as self number two.
With the aid of a lady super naturalist, he tries to make sense of things.
There are two of him in one body, and a girl for each of him.
That puts this man in Double Trouble.