The brain stuff often winds up getting put off until after the depression lifts. Do not set yourself difficult goals or take on a great deal of responsibility. Break large tasks into many smaller ones, set some priorities, and do what you can, as you can. Do not expect too much from yourself. Unrealistic expectations will only increase feelings of failure, as they are impossible to meet.
Perfectionism leads to increased depression.
Participate in activities that may make you feel better. You might try mild exercise, going to a movie, a ball game, or participating in religious or social activities. Don't overdo it or get upset if your mood does not greatly improve right away. Feeling better takes time. Do not make any major life decisions, such as quitting your job or getting married or separated while depressed.