Lately, I'm always exhausted. My body (feet and legs) feel like they do when I'm on vacation and have been walking around all day, very fatigued. When I wake up, I feel like I didn't fall asleep. Every so often I get in a nap that helps, but overall I'm always tired. Tired, but not sleepy because it takes forever to fall asleep

Every so often I do get a burst of energy and it's a world of difference from how I normally feel throughout the day.

Any suggestions? It's starting to drive me insane.