Greater heights @ Niijima

This week @ work was really rough - even my boss assured me that "it will be back to normal". Many mini projects on hand, and have been working slightly late despite not being month-end. When things dont make sense, I realise I am starting to lose my patience. After a challenging day at work, I always feel a need to talk about the problems in order to "let it out" to feel better. I wonder when I can reach a state of mind where I will always be non-violent & nonaggressive. How do I make a clear-cut division between work and after-office life; and not bring my work problems home?