The histology of an eternity

Like M. Kaput, on first read I thought this could be trimmed a bit -- but looking for specific examples, each modifier seems necessary and a lot of them are building up the punnish metaphors.  The only stanza I thought could do with a short back and sides was this one:

"Somewhere in the distant present
a siren screams, drowning
in a puddle of predestiny
the irony submerged
beneath ripples of nausea
washing over stagnant secretions."

Saying both somewhere and distant in the first line probably isn't necessary -- I'd suggest you pick just one as both indicate that it's not right in front of you.  You could also just say "drowning in predestiny", I don't think the puddle is adding much.  Submerged already implies beneath -- try submerged in or submerged by.  

Loving "petrified excrement" -- sounds so much better than scared shitless. 

Rather than chopping off adjectives all over the place, I would suggest pulling some of the ands.  Commas and line breaks will do it for you much faster (and sometimes quick is best).