Jadey thank you for your comment. In fact I'm certain that you have communicated with someone on GN who has, or has had, mental illness issues. There's me for instance. 
I spent (I think - it was a very muddled time) about a year on anti-depressants, and yes, depression is a mental illness. Even if the usual statistic of one in four (people suffering from a mental illness) is over-hyped I think it's true that a great many people will suffer from some form of mental illness during their lifetime. Agoraphobia (and other phobias), OCD, depression, bipolar, anxiety disorder, post-natal depression.......these are the 'hidden' illnesses that still continue to be stigmatized and yet are actually prevalent throughout our society. Schizophrenia and psychosis are rarer forms of mental illness, but seem to generate a disproportionate amount of coverage from the media; sadly this is mostly due to actions taken by mentally ill people when treatment (for whatever reason) is inadequate.