I often will say stuff like 'doing ok' when people ask how I am simply because it seems ludicrous to respond with the problems you are having. 'Doing ok' in this case basically means 'I'm surviving and handling the current situation without breaking down, thanks for worrying about me'. Often I can be in a pretty shitty situation, but at some point that just becomes par for the course and while you aren't happy, at least things aren't actively getting worse and you are used to the current level of misery.