I wish I could remember the name of the damned fic!
Sess comes out of the woods to the Inugroup badly injured and not entirely there. He's holding Rin and has come looking for help. He wants Kagome to help Rin because she's injured. Only one problem, she's actually dead. Sess has been shot with a certain poison that is slowly driving him to a mindless animal (I can't remember if this was Naraku's doing or not) and the inugroup has to keep him calm while Sango goes off for the cure.
That's all I can remember! I hope it's enough for someone to be able to tell me what the title is!!

sounds like A Self Called Nowhere by Noacat
And if that is the story you're looking for then she hasn't updated in a loooong while. But its still a good read.

THAT'S IT!! WOOT! It was in my favorites all this time! I didn't realize because the first couple paragraphs are in in the modern era! Ty!