If you are feeling depressed, or have been diagnosed by your physician as having melancholic depression, it would really help if you stepped back and evaluated your life.  Often times, it is our critical and melancholy thinking patterns that lead us to depression, and that is definitely something that we can control.  You can decide what you let get into your head, what you think is important, or what needs your attention.  Melancholic depression is a serious sickness that lasts longer than typical periods of sadness, and will interfere with many parts of your life, relationships, school work, or job.  It quite often will require a consultation with your doctor to help you get out of your depressed mood.