call it what it is: a fat fast. 2-3 days isn't a sufficient duration to cure candida or any of the other conditions you listed. those can take weeks, or even months, to resolve.
your body detoxes itself through the skin, liver and the kidneys. a primal diet will optimize the performance of those organs, and likely heal things like ibs.
as someone who spent decades with disordered eating i totally get how great you feel after a few days of no food. as somebody who now feels pretty good about my relationship with food, i still don't think periodic fasting is a bad thing. but farking hell, it's not a "cleanse".
As I ate the oysters with their strong taste of the sea and their faint metallic taste that the cold white wine washed away, leaving only the sea taste and the succulent texture, and as I drank their cold liquid from each shell and washed it down with the crisp taste of the wine, I lost the empty feeling and began to be happy and to make plans.
– Ernest Hemingway