I have felt the same exact way you do at times. When I experience a depression episode it lasts for an extended amount of time and I cannot will myself out. For sure, on one else can will me out of it. They make all kinds of suggestions and tell me all sorts of things I should do. They simply do not and will not understand why I cannot do them. It truly is an impossible situation whether you know what you are specifically depressed about or not?

Is there something specific you feeling sad about? Or does it seem just as a blanket feeling covering you for which you cannot pin point the cause?

The only thing I have found that bring me out of a deep, long lasting, depression is Professional help and medication.