Hey Fit,
I know that my first two weeks, I bounced back and forth from being very high energy and then crashing and sleeping most of the days I had free. It was like I couldn't find my happy medium (whatever that is). But then I kept hearing that I needed to be extra gentle with myself, that my body is literally re-calibrating itself, readjusting and generally freaking out that I am no longer pouring a toxic liquid into it.
I am into my second month and still get these feelings, but the positivity, clear headed feeling and energy is getting stable. Give time time for this, rest when you need to, you'll get to a point where you feel wonderful!
Congrats on 11 days!