'Bitterness' in the Bible

"Even I will not restrain my mouth; I will speak in my spirit's anguish; I will complain in my inner self's bitterness.

He will not allow me to {catch} my breath; rather, he will fill me with bitterness.

"My inner self loathes my life; {I want to give vent to my complaint}; I want to speak out of [the] bitterness of my inner self.