As Jonah was sinking away in the sea, he remembered Yahweh. His prayer came to Yahweh in his holy Temple. Jonah was lucky, since he worshipped a true loyal God. However, those who worshipped vain idols would not have loyalty.
This author complained about his bitter thoughts. His affliction was like the sour bitter wormwood plant. His homelessness annoyed or galled him. This is like the prayer of a homeless person. His soul was continually sinking. However, when he thought this out, he still had some hope. These three verses start with the Hebrew consonant letter Zayin in this acrostic poem.
David prayed to Yahweh. He was willing to get a response at an acceptable time from God. He knew that God loved him. Thus he wanted to be rescued from sinking in mud. He wanted to be free of his enemies. He wanted to get away from the deep waters. He did not want the flood to come and swallow him up. He certainly did not want to go down to his grave, the pit that would swallow him up. This time of the flood of water overtaking him continued from the opening verses.
Instead of an ending praise, this is like a command to God to help them. This psalmist wanted God to wake up from his sleep. They did not want to be cast off forever. Why was God hiding his face? Had he forgotten about their afflictions and oppressions? They were sinking like dust on the ground. He wanted God to rise up and help him. He wanted God to show his steadfast love by saving them.