Not sure there's an answer to this, but when does feeling low and crap because, basically life is shit at the moment - no money, work getting harder, kids suffering from all sides and no sign it's going to get better, in fact, most likely to get worse - slip into actual depression?
I honestly can't remember the last time I laughed or actually felt happy or positive but then, due to the above, there isn't anything to feel positive about.
Not sure if any of this makes sense really.