You fast from food for five days straight? I regularly fast for religious reasons and don't flinch from a two day fast a few times a year but five is intense.

I did five days one time, and broke the fast by eating watermelon. A few minutes later I vomited just pure watermelon pulp. It wasn't even gross, it was like there was no digestive liquids in my stomach to do anything to it. I had to teach my body to eat again. You do this regularly?