Since Aug 5th I’m down 13 lbs. Is that ok?

You certainly shouldn't feel crap - some people get keto flu in first week or two because they need more salt , water and its  body adapting but after that you should feel energised 

That's awesome! (Saying goodbye to 13 pounds, not feeling bad.).  

Do you take supplements? I had to start taking  potassium and magnesium and a daily mutivitamin to  maintain my energy, also drinks as much water  as you can stand!