The above suggested herbs work wonders. Do you take vitamins? A lot of people experience fatigue from simple things such as poor sleep, vitamin deficiency, not getting enough exercise, or not drinking enough water. For energy, the B vitamins are very important. Thanks to the hurried times we live in, food is prepared quickly without enough thought to nutritional value.
How are your sleeping patterns? Not getting enough, or waking repeatedly can seriously drain you. If this is the case I would look into herbs and minerals that can aid in sleeps natural process. Some of these herbs include valerian, chamomile, and lavender! Also making sure you get enough of the mineral melanin, is vital.
If you have any health issues please check with your doctor before adding anything to your regimen.