there are times during the day, sometimes. that i crash. i need to rest for 20 minutes or so.
i think the issue here is. your caloricly restricting and carb restricting. once you up your dietary fat, you should have more energy. its like you were trying to do both diets at once. and that could be dangerous, and counterproductive to muscle retention/gain.
you must give your body fuel. its funny, the more i eat the deeper into ketosis, i get. and i do very light cardio. i walk with my HR at 120bpm for 35 minutes twice to three times a week. i feel i will lose more fat by increasing my muscle mass. in my eyes cardio is great for burning calories, but once i am finnished for the day, im not burning at an accelerated rate.
but the more muscle mass, the more my body will burn at rest. remember when we lose weight, our body wants to eat away at our muscle. and of course muscle is attractive.