Dog days are the days enslaved to addiction
the hiding "around corners and under beds"... the denial of having a problem... trying to hide from the spiritual awakening required for Recovery
"tipped away down the kitchen sink" are words almost cliche for ending the drinking/drugged life
The happiness (spiritual awakening) comes after the days of withdrawal & working a program hard - 'Running fast' for your loved ones...
''...leave all your love and longing behind" is about the requirement to let go of everything in the quest to recover - let go and let god they say... common talk in various spiritual pathways and 12 step programs