It's the state of being before you're dead.
It's the mire in which you wallow.
It's a sh*t sandwich, and if you've got more bread
the less sh*t you'll have to swallow.
this verse does not flow nearly as well as the rest. It seems you've sacrificed the meter for the inclusion of 'and if you've got more bread'. I like the metaphor, for life, but if you could convey it, without sacrificing the meter, it would make an excellent write.