I don't know the answer, but I completely feel your pain... (I agree that unexplained fatigue should result in seeing the doctor, but I'm afraid it's not something simple, and my deductible is too high to spend it all chasing down a rabbit hole. And I sure as shit am not going to risk a CFS diagnosis until certain people settle down and stop threatening to undo protections for preexisting conditions.)
Also, I just realized that I doubled the amount of coffee I used to make the pot this morning (it's a mini coffee pot - I don't drink a full sized pot of coffee!). No wonder it tastes weird, but... that sweet, sweet caffeine is going to be nice when it kicks in!
I actually have a list on my desktop of energizing/focus strategies. The benefit is minimal, but sometimes a small boost is enough: get some sunlight; do a 3-5 minute meditation with very slow breathing; 3-4 songs worth of high energy music (after 3-4 songs I get diminishing returns); go for a walk around the block (assuming you can find pants and aren't wearing too much whore makeup); eat something small (doesn't apply to everyone, but I tend to forget to eat, and low blood glucose can reduce focus and willpower); extra caffeine as a last resort.
Would love to hear anyone else's strategies...