"Check out The UltraMind Solution by Mark Hyman. At the very least, go to a bookstore and take the short quizzes in the beginning of the book. They showed me (later confirmed by blood tests) what amino acids I was deficient in."
OK Gardener, I'm off to the bookstore, they've got it in stock. Energy, I love the stuff. Not having energy is probably my biggest fear in getting through. When I've got energy I'm happier and more confident, when I don't I ruminate. Gotta go!