Yep, absolutely normal.
It takes about three days for the poison ( nicotine) to work its way out of your body.
Tomorrow will be a bit more pleasant, as will the next day and the next...
Quit one day at a time. Heck, one hour, one minute at a time.
Find the June 2016 pre HOF group here in the forums under Quit Groups. You'll find directions for posting roll. Roll is our daily promise to quit.
We've all been where you are. I'm 47 days quit. It gets better, but any day could be the day I cave, so I make my promise daily.