By Terry Cornick "Mate, why didn't you tell me?!" The first words a close mate asked me when he came back into work after paternity leave.   "You cruised through it!" I wanted to scream out, "You have no f***ing idea!", but I just smiled. I am a good actor. Honed by years of hiding mental illness. You cannot prepare anyone for a first child. Life does not stop; it just shifts seismically to a scenario where you cannot remember what came before. Even the simplest of daily decisions completely revolve around your child's routine and moods. Sleep deprivation, the noise torture of crying, the constant rocking and standing on your feet to settle, the several changing of nappies a...