Psychiatric Disorders???

Today I was reading an article about GAD (Generalized Anxiety Disorder). According to criteria for diagnoses, most of patients should be feeling bad about things running around them, they should be thinking that they are in failure……………. And then I started thinking about famous writers and authors. What these people have written about the world and life, shows their frustration regarding what was going with them and around them……… I have read many autobiographies, most of them has negative ideas about life, I have read poems talking how life in this world is difficult and in some cases nonsense. Reading Depression, Bipolar disorder, anxiety…etc and thinking about these famous people, I don’t know if these people were sick……or what they have written is just the reality…….. In many books it is said that pain full feeling gives great inspirations, and the great poems start with it……..what does it mean? I don’t know…….maybe it means when you are in a bout of depression or anxiety you can say or write something great!!!!!!! So if we treat all these depressions, and stop all pain full feelings what will happen to world of literature? I don’t know………. I am not a writer…..nor am poet…….I am not in a position to think about the world of literature, but I am a doctor……..I would be still treating psychiatric disorders.