Week 1 was about eliminating the foods causing inflammation & weight gain in your body.
Week 2 will likely mark a shift in energy for you. That could go either way: a huge shift upwards OR a huge shift down. The downwards shift comes from having to re-train your body to run off of a new fuel.
If you're in the second group, ride that wave. Your body is simply learning to run on a slower-burn energy, and you'll get the drive to be more active again soon. And this time, it's going to be a sustainable, clean energy...not that caffeinated sugar rush you had before.