I'm on day 12 and it was hard for me day 9-11. My body did another cleanse. My BM all of a sudden got very dark again and my head hurt. I'm actually thinking of stopping on day 14, Sunday and being pleased that it was 4 days longer than last time.
You may very well be detoxing again. I'd drink extra water, take a bath and be good to yourself. Tomorrow is almost here and then you'll be so pleased you stuck it out.