I remember being so tired long after I had the diet under control. At the six month point I was considering an iron shot, gamma shot, or some other drastic thing, (that I am equally certain my ignorant physician would have denied.)
Instead I found my answer in ferrous gluconate-an iron supplement. Five days later, I was up and around like a bear out of hibernation.
From the casual surf, I found patients had the following experience with CD and fatigue: Check out
adrenal fatigue http://www.celiac.com/gluten-free/index.php?showtopic=22456
It's a very informative read. Keep searching, don't give up and eat better, feel better.