I am on my six day of Water Fasting now. And yes I felt nauseous on my first couple of days and I had a headache on my first day. I don't feel that great today either. I had a stressful day at work yesterday, so I felt so drained last night and so weak. I feel the effects still today. I was dizzy and weak and even a little nauseous again. I see those symptoms as signs of detoxification. I just wish I didn't have to go to work on Monday and take a full benefit of the fast. I may take a sick day. So, don't be discouraged. We are all going through our pains to earn a good health. Good luck.