Can you tell us what you have been eating. I am looking for
Franken foods and hidden carbs. Also not that 2 grams would make the difference by 20 carbs sould be your target.
Fruit. Fruit contains Fructose (fruit Sugar) that will refill your liver Glycogen levels and keep you from Ketosis.
How much water are you drinking? Any exercise?
http://forum.lowcarber.org/showthread.php?t=182859 Read this.
http://forum.lowcarber.org/showthread.php?t=183774
Jag