I think you might go through withdrawals maybe? Both from the caffeine and from the enemas. On the caffeine front you might feel really sluggish. As for the enema withdrawals, perhaps your body gets so used to not having to work to rid itself of its contents that without it you end up not able to go for a while?
Either way you're screwing with your regularity, so the pendulum is bound to swing the other way hard.
What I'm curious about... what brand do they use? Do they bother getting the good stuff? Do they grind their own beans?
I skimmed the article and though it mentioned something about folgers? Also I think the lady got kidney stones when she tried to stop. Allegedly.