I've come to the conclusion that limiting carbs is what is making me tired. And I'm tired of being so tired. If things go as I hope they do, I will not have the luxury of napping 3 times a week. So I'm introducing a few more carbs.
The good news? I've broken the soda habit. I have to still manage it (as with any addiction), but I can go days without it if need be. So that was one plus. (And no, I'm not in caffeine withdrawal, I've had lots of that in my tea!)