the.com/sea of troubles

means An overwhelming mass of difficulties or misfortunes so large and tangled that no single struggle seems able to end them.

from From Shakespeare's Hamlet (1600s), the 'To be, or not to be' soliloquy: 'to take arms against a sea of troubles / and by opposing end them.' Scholars have long puzzled over the odd image — you can't really fight a sea with a sword — and some suggest a mistranslation or mixed metaphor, possibly confusing a Greek word for 'a mass of troubles' with 'sea.' But whether by design or happy error, the phrase stuck, and 'sea of troubles' became the common way to describe troubles too vast and shapeless to simply conquer.