People who have seen Donnie Darko....?

I think I understand it lol. I think that Frank woke up Donnie so he could live the 28 days to guide the "Artifact" back to Present Universe. And then when the artifact goes back to PU and kills Donnie, the 28 days we went through in the movie never happened. The people that died live. Donnie dies. The artifact went to another universe which caused all of the other people to die, so Frank woke Donnie up so he could guide it back since Donnie was most affected by the artifact...