Is this it?
www.fanfiction.net/s/554905/1/Kanashimi_no_Hate_ni_End_of_Sorrow
Kanashimi no Hate ni End of Sorrow» by Tamysan reviews
It is two years after the defeat of Naraku and Kagome's heartbreak of seeing Inuyasha chose Kikyou. However, Kagome is summoned back when a new danger threatens. SessKag, Completed!
Inuyasha - Fiction Rated: M - English - Drama/Romance - Chapters: 31 - Words: 66,557 - Reviews: 363 - Updated: 2-4-02 - Published: 1-19-02 - Complete
I know that Jaken is being controled by Onigumo in chapter 27. He is saved later on.
This is one of my all time favorites!