Feeling frustrated? Stressed? Gloomy? I've been there myself. Whether we're at work or home, it's normal for negative thoughts to permeate our thinking, leading to depression, anxiety, and other unpleasant health outcomes. Here are 3 proven tricks for turning that frown upside down: 1. Just smile: Research shows that merely smiling for no reason can raise your spirits in a big way. In fact, studies have found that when subjects smiled while talking to someone on the phone, the people on the other end perceived the subjects as being in a good mood. 2. Focus your attention on what makes you happy: Seeking out positive, feel-good stimuli allows you to mentally disconnect from your troubles, even if only for a minute or two. For example, I have always had a soft spot for animals. When I'm down in the dumps at work, nothing changes my attitude for the better like seeing pictures or videos of baby animals, whether they be kittens, puppies, or pandas. In your case, it mi...