The best answer is to seek some professional help. It can be as easy as going to your regular doctor. If nothing else, she/he can refer you to a psychologist or counselor for talk therapy. Antidepressants may be in order if your depression has been chronic or long lasting.
Other things that you can do in the meantime:
-Exercise. I know you’re probably exhausted by the thought, but even a slow walk outside in the fresh air can help a bit.
-Eat a healthy diet. Try to avoid sugar and white flour products.
-Drink plenty of water and try to stay away from alcohol (which is a depressant).
-Build a routine into your day. Building structure throughout your day can help you be more productive when you’re feeling unfocused and foggy. Make your list the night before of what you’d like to accomplish the next day. Make it realistic, i.e.
1. 20 minute walk before work
2. Call friend to meet for coffee after work
3. Do 2 loads of laundry and put them away
Very simple things. Not too many. Make it in list form so that you can check them off when done.
-Make social contact with someone at least twice/week if possible. Make sure that it’s not with someone who will exacerbate your depression. Being sociable is hard when you’re suffering from depression, but it’s important to make the effort. Being with others with whom you feel supported or – even simple comaraderie – will help you see things from different perspecitves. May even put things into perspective.
-Do something life affirming each week. Plant flowers, visit nature, volunteer, get a massage, etc. These things will help you connect with a different aspect of yourself.
-Journal each morning or night. Just put pen to paper and write down whatever comes out. It can be a sentence, a paragraph or a page. Sometimes, seeing thoughts on paper help us organize them better and makes them less threatening.
-Get enough sleep, but not too much. Try for 7 to 8 hours per night. This is a tricky one with depression. Exercise and a healthy diet will help here.
But please, please, please refer to paragraph 1 of this long answer. Whatever you’re feeling, don’t be embarassed about it. Depression can be devastating and can happen to anyone. With the right help and a little time, the light will shine inside you again. I’m wishing you a fast return to your happier, stronger self.