Personally, it would help my understanding of stress related illness to know what the symptoms are that people experience that make them feel they are not fit to work.
Someone in my office is off with stress and I know that he has told management that a contributing factor in this is the atmosphere in the office following a restructuring last year.
But the restructuring didn't even affect him personally - it did affect me and has totally fucked me financially and career wise. Just as I made the decision to look for a new job, I was diagnosed with an incurable lung disease and am on medication with horrible side effects.
I have never felt more stressed in my life but I feel I just have to cope with it, and actually I have been working at home more than usual and that has helped.
So I think i have an insight but I don't really understand how it manifests itself on a personal level. The whole secrecy and protecting people's privacy doesn't help either, it makes it look like there is something to hide, or that they don't want to say he's off with stress because people will judge him! (I'm senior enough to have been told a broad outline but haven't liked to ask more)
Apart from anything else, my GP is totally unsympathetic to be the point where I think he would require me to sectioned before he'd sign me off with anything stress related.