The monkey on my back starts beating on its chest,
So I unleash the demon on my chest to get him off my back.
I figure I'll drown the darkness and drag him underwater,
But the b*****d learned to swim, so I bid my serpent to crawl.
It finds itself around the demon's neck, but I know he'll never go.
I make my way for shore, but the serpent keeps me undertow.
But, there he is, the monkey from my past, offers a hand for a place on my back.

The monkey represents vices, bad habits, and coping mechanisms.
The demon is my damage, the trauma.
The serpent is that edge one gets from being isolated.
And water is sadness.