Keep your head up. Literally. If you were told there was a depressed person in the next room, what would you imagine? Are they sitting in the corner, slumped over, with a lost look on their face? Are they not moving much? Probably. Moods manifest physically -- change your physicality, change your mood. Go for a walk. Alright, that's sort of metaphorical. But what that means is to control an emotion, control your environment. Get out and do something else. If you feel yourself festering, get up and surround yourself with different stimuli. You're literally forcing your brain to take in distractions. Meditate. For a long time, meditation has been known to quiet the outside world and calm the senses. It clears your mind and helps attention and focus even when you're not meditating. But it also quiets negative thoughts and centers you externally, not internally.
Belinda