I've had the same symptoms but when i reduced the Grapefruit-Seed-Extract dosages my stool became normal in two days.
Nausea, chestpains, slight coldness and flu-like dymptoms include in the die-off process especially when taking bigger dosages, the die-off is also called the Herxheimer reactions.
GSE is both laxative and lactobacilli reducing.
If you eat fresh fruit - don't, since they are rich in glucose and very candidafriendly.
Reintroduce fruit to your diet first after your signs of candida are completely gone.