My son, age 20, is constantly fatigued, unable to keep up with his daily activities. He can sleep 12 hours in 24 hours and still not feel refreshed. He has body aches and pains, frequent headhachs, some dizziness, lack of concentration, and is always cold. He also doesn't have much of an appetite most days. But when he's hungry, he is HUNGRY and must eat immediately or he gets very dizzy and can pass out.