Time travel, redo fics

[ologist.livejournal.com]

Hi all!  I'm looking for time travel fics where a character is sent back to their younger body with their memories intact in order to fix something that went wrong in the future (or even if it's entirely accidental, but they decide to fix things anyway).  I don't want fics where they get sent back to the future quickly either, they have to be stuck there permanently, taking the slow journey home. I've looked through the time travel tags and I didn't see anything exactly fitting this criteria but I may have missed it.  

If it's at all possible, links to fics hosted on fanfiction.net would be fantastic, but I am of course willing to take anything and everything.  Het, slash and gen are all welcome too.

Thanks in advance!