This is a scenario I have played out a few times in my mind. I sometimes wish I had an observer so I could show them all the mental suffering I go through on a daily basis. Everything from how interactions with people is basically me being an anxious, dumb minded wreck to seeing how little enjoyment I get from the things I should be enjoying.
Ideally the observer should be placed in my head and feel the same things (ooo maybe a cool sci fi story can be made about this). They eventually will soon realize that something must be done and this state cannot be allowed to continue. They will also conclude that no, realistically, nothing can be done and suicide would be a good option.
People giving advice about mental issues from the exterior can be a shot in the dark