When I start to feel depressed, I immediately go inward to try and figure out what is wrong with me or my environment. I feel like I am doing something wrong. Then, when I come down with a cold or another sickness, I realize the depression should have warned me to take care of myself. When I feel a depression coming on, I have learned that it means I might be getting sick. Once I am unquestionably sick, I am already depressed. Why is this, and can anything be done to prevent it? Can’t I just rest and heal, knowing that things will be better soon? Depression and sickness share an important quality: both leave us low in energy. I feel like something is wrong with me when my energy slumps, do you? I lose interest in things that should matter, and that alone makes me feel more down. But …