Time of the month??? That ALWAYS gets me - and after 9 months of pregnancy and a year nursing, I am not used to getting it again, so it surprises me! Drink, drink, drink, drink. Also, remember that Atkins does not always mean a 15 pound weight loss and instantly tremendous feeling for everyone. Every body is different. Yours might just be feeling a little whacked out getting used to it. STICK WITH IT!!!! IT WILL pay off!!!!