How are your electrolytes? Are you getting enough sodium, potassium, and magnesium?

While LC, you need more sodium than average because you lose sodium as you lose water. The water loss is from your glycogen stores emptying. There is a sticky at the top of the group with information on electrolytes. Read that.

You mention "so much protein"... are you eating a decent amount of fat too? You'll get better energy if you've got a good portion of your calories coming from fat since you don't have much to lose.
With low carb, it's about using fat for energy. You don't have a whole lot on your body. You'll need to consume it. Real fats. Not margarine and vegetable fats.
Also, calories. Are you eating enough? You don't have much to lose and you don't have much stored energy on your body and you've just put your body through a major metabolic change that creates an electrolyte imbalance if you don't actively correct for it.
Something's gotta give.


You need salt! Stat!
I would also suggest a very small calorie deficit while you adjust. If at all.