The thing that’s made the biggest difference for me lately is just eating breakfast (I almost never ate breakfast in high school or freshman year of college). If you don’t, you should definitely try it and see if you benefit from it. I’m not always hungry when I wake up, but 2 apples and some milk or a protein shake makes my mornings a lot easier. A few apples and chugging a glass of milk takes like 5 minutes tops, so you don’t have to wake up earlier than normal for it like you would if you were trying to make an omelet or something
Could be the low carbs.
Could be a lack of certain vitamins/minerals (Magnesium for example).
Could be your sleep habits.
Could be 10 other things or a combination.
It may sound counter-intuitive, but I force myself to wake up at 4AM most days and it has actually made me more energized throughout the day. I think it’s because I sleep more soundly at night.
If you play video games especially fast paced shooters (like COD), avoid them at night. They’re too stimulating. It took me about 4 years to figure that out…
I also avoid lifting at night. It took me a while to figure that one out too. I would fall asleep quickly, but toss and turn after about an hour or two. I used to pace around my damn house at night because of it. Weight training at night is just too stimulating for me that’s why I lift in the AM now.
My $0.02, the above might not work for you of course.
As others said, could be a lot of things. However, I would say it is likely due to your low calorie/low carb diet. I don’t do well at all on low carb, and lack energy and a feeling of well being when I’ve tried it. I would say up the carbs and calories, and see how you feel.
Calories are way too low. Simple starting point would be BWx15 and subtract 500 calories, that would put you at 3700 calories daily. Follow that for 2 weeks and adjust depending on your weekly weigh in average.