I'm not sure the exact year the movie came out but I know it's after or in 2000.
It's about these two brothers who are opposites and don't see eye to eye.
The good guy is married.
The trouble maker isn't.
And somehow they get mad at each other and end up driving off and get into a car accident and they switch places.
The trouble maker wakes up in the hospital with his brothers (good guy) personality, memories, everything.
And the wife is all freaked out.
That's pretty much all the info I have.

Possession