Be sure to try to relax. If you can - go away on vacation. It is advisable to change the situation, to go somewhere, it's best to overseas tour. New experience, positive emotions - that's what you now absolutely necessary. If this is not possible (eg, due to difficulties with finances), still try to get as much positive emotions.
Communicate with people who are pleasant to you, not only personally, but also on the various forums on the Internet. Watch the entertainment programs, attend plays, concerts. Read interesting books. Try to find yourself some new hobby.
At the first opportunity to choose the nature. Just a few hours spent in the woods, on the banks of the river or lake, in the garden, will bring you great benefits, not only physical but also psychological.
Minimize the receipt of negative emotions. Do not watch criminal chronicles, reports on natural disasters, acts of terrorism. Avoid communicating with both envious, grumpy people, and with the "eternally sick" hypochondriacs. It is not easy, especially if they include your relatives or friends. However, try to communicate with them as little as possible, at any convenient excuse.
Make changes in your diet. Try to eat more vegetables, fruits, berries, seafood, nuts, greens. In other words, prefer easily digestible food, rich in vitamins and trace elements. Respectively, reduce the consumption of fat, smoked, salted and canned food, even if you have always loved it. Health is worth it.
If you are strong and healthy - you can also try to overcome stress and depression in some extreme way. Hike increased complexity, the more skydiving probably provide you with adrenalin pumping excitement and a lot of strong emotions.