thats pretty much what DID is here in America....having two or more alters that do and think differently than the aware self, that takes over control many times, as a result leaves the person with having memory problems (you call them black outs) beyond the normal forgetfulness.

here's where you can read more about what in general american mental health treatment providers feel dissociative disorders including DID is....

http://www.dsm5.org/proposedrevision...Disorders.aspx