Fever and chills aren't a part of the "Induction flu" or carb withdrawals. So see a doctor.
As for the zero carb approach, as Mom said, that's not Atkins. Atkins isn't a meat, cheese and egg only diet. So please read the book and do Atkins the proper way. If you still choose to do a "zero carb" approach, please do not call it Atkins because it's not..