it's a story told in three different times, one is the past with a queen and aztecs, one is the present with a husband who's a doctor and has a wife that he loves and is dying of cancer (she's the same woman as the queen) and the last time period is far in the future where the man is floating with the tree of life in space. He's bald, clad in white and only eats a tiny bit of the bark to survive. The movie ends with him flying the tree into an exploding sun (or something) and it brings it back to life. In the past, he drinks some elixer of life and plants start growing from within him. I know this is very fragmented, but it was years ago, if you know what film I'm talking about from this terrible description, please tell me, thanks!