Depression is a feeling of extreme sadness, anxiety, helplessness and hopelessness. Depression is both psychological and medical in nature. There are different symptoms of depression. However, it is important to note that it is the persistence of the feelings for more than two weeks that can make an individual to suspect that he or she may be suffering depression. I encourage you to read more about depression from the link provided below. and in any case you feel that you need help, please do not hesitate to seek help.