It is likely to be carb withdrawal. Particularly if you tended to eat a lot of carbs before. Take some pills and look after yourself. Your body will get used to lower carbs soon.
Poor you, Weasey is right that's what it probably is. Of course it just might be nothing to do with LL and you're just under the weather
Just be gentle with yourself and if it is. RcUse of carb reduction it will pass as Weasey says.