I was going to mention iron, too. Women need more iron than men, and it's even more important for any woman in an endurance sport. And since you know you already have trouble with energy that time of the month, I'd start incorporating foods with lots of iron into your regular diet. I'm more into getting vitamins and minerals out of food instead of pills whenever possible. I have been having more spinach lately for this purpose. I put it on sandwiches instead of lettuce, in omelets, salads, etc.

I started using it on sandwiches instead of lettuce because of Subway. They offer it there and my friend does that, so I started doing it. I'd look up foods that are high in iron and work on getting more of them in your diet.

I also recommend FRS, if you haven't tried it. It's a natural energy drink that Lance Armstrong endorses and we drink a lot of around here. I drink it fairly regularly, but particularly about 30 minutes before a significant ride or race. They also have chews, which I've been doing more lately so I don't have to pee too soon. (My husband calls me the potty monster!)

If you find it in a store, it's pretty expensive, but cheaper if you order it online and get auto shipping. You can get it in canned form or concentrate (which is cheaper), and the chews. But try it from a regular store first and see if you get sucked in. It's kind of hit and miss where you'll find it. I have seen it at grocery stores, but not all. I got some at a car wash once, which was a shocker.

At the very least go online and read about it. It has quercetin in it (along with tons of vitamins), which is a really strong antioxidant that helps hold your adrenaline up, instead of it plummeting back down as it normally would.

If you do take iron pills, remember they say it's dangerous to take too much, so be careful. Plus, it can cause constipation. Not sure that would be an issue with natural whole foods high in iron.