Hey, I posted a reply to you in another thread but you may not find it so I just wanted to relate it here. For me, day 3 is the worst! I think that's the point, on average, when ketosis is just beginning to kick in and carb withdrawals are at their peak.

Suggestions: Drink LOTS of water, take your vitamins (especially potassium and magnesium), and stick it out.

You should feel better soon!