I've been on this diet for 6 days properly, 8 days with slight cheating. No headaches, nausea, flu-like, or dizziness. Just GI symptoms. Bloating and really painful pressure, plus constipation has gotten worse. I really think I'm quitting today as I am so bloated I feel like I'm about to burst open. I'll have some oatmeal for breakfast and hopefully will feel better soon.