I was fatuiged and tiered all the time for about two years. But, I realized that I needed to loose some weight, so I joined a gym. To my surprise, I became an energy bomb bubbeling with alertness and awakeness.
So I can only speak for myself. I get more energetic when I actually use more of my physical energy. And eat a lot of protein and healthy fats. And get my vitamins and minerals.
Do you work out? You don´t have to pump iron. Squash is great, jujitsu is great. Salsa dancing classes. Anything fun!

Any activity that gets your heartrate up is great for getting more energy.