Hi China,
I'm not sure about candida but maybe toxins? I believe it's called a herxheimer reaction, where large quantities of toxins are released into the body as bacteria. Basically you're killing more stuff than your body is able to get rid of so you have the nausea, fever, chills, ect.
I took 3 or 4 tbsp today but with food, as I'm not ready to cleanse just on VCO yet and I still get diarreah at night. LOL I didn't exactly "work my way up" to the table spoons either :P. But my daytime nausea is totally gone because of the enemas I do in the morning. I can handle the runs for now.
Some peole suggest an Epsom Salt bath as another way to release the excess toxins/bacteria via your skin.