I was under the impression that rest is so so essential and vital on a water fast. So maybe because you are working your body isn't being allowed to rest.
Have you considered a juice cleanse as an alternative? (sorry if that is annoying)..
Also, while Water Fasting your bowels are shut down so they can also rest, so taking enemas or lax doesn't really make much sense. I have read that a faster can feel worse if they use an enema. (Although I don't know through experience).
However I do know through experience that if you ride out the detox and discomfort, eventually you will feel better. Infact better than you have felt in years.
I am on day 9 and since day 3, everyday has been easier.