Cingratulations on doing so well post fast. I don't think you will gain anymore if you do not revert to your old eating patterns. I only gained back 6 lbs after my 30 day juice fast, like you said refilling of the colon. But I also did not go back to my old eating habits. I didn't starve, but I only eat fresh or unprocessed, homecooked meals. And I also exercised.
By the way, if you don't mind me asking, how does your skin look after this quick and significant weight loss? Is it more loose?