Laura, if you have established yourself in ketosis, you don't need to add in more carbs. Your body is perfectly capable of manufacturing them in the liver from your dietary protein. AND it's perfectly capable of using fat (both dietary and body fat) to fuel your workouts.

In fact, there are increasing numbers of serious athletes who are very low carb, because fat is a more stable form of energy, so it's more likely to prevent hitting a wall during periods of intense exercise.

If you are tired and NOT losing and not feeling your best, try salt first, as GR recommends. But you may have something else going on, too. I'd ask my doctor for a thyroid panel, just to see if that, perhaps, is contributing.