I went through the same thing.
when you kill off the candida it normally dumps in the colon . i got terrible constipation and the only thing that worked was high doses of vitamin c until i had to rush to the loo lol. also a product called oxycleanse is really good but expensive. its important to keep the bowels open because i couldnt go for weeks at a time and got extremely ill. the vit c definatley works! get it in high strength chewable tablets from any supermarket or chemist but make sure you will be staying at home in the following hours after taking it, it will definatley clean you out lol