From Mark

Is there a book or website or test that you could recommend to someone to see if they are suffering from depression?

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If you think you are depressed, you probably are. You could google "symptoms of depression" and see if they fit. Is there an event that happened recently, a divorce, break up, death or something that occurred in your life that you are feeling guilty about? If it turns out you are depressed my best feed back for you would be to volunteer somewhere and be of service. It's very hard to stay in a state of depression when we are assisting others. Good luck!