It's one of those days

I was waiting for my train to arrive at City Hall station.
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Suddenly tears welled up in my eyes. The next thing I knew ... I cried. Yes I cried while waiting for my train. I quickly looked down so that no one would notice.
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At that moment, I felt sad, I felt pity ... for myself. Felt tat I wasted my life working for this company. Hate the feeling that, what I had done was never good enough for my boss or my clients. They always wanted more. I 'lost' myself and my life, working from 9-9 every other day. Felt real stupid for putting so much time in my work. Not worth it.
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Maybe it was 'accumulated' stress/frustration at work that made me cry. Maybe I was just tired, 'burnt-out' ...

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Then I felt 'something' ... I know why I cried ... It's one of those days.