en_tn_condensed/psa/055/004.md

My heart trembles within me

Here, "heart trembles" refers to his emotional pain and suffering. This suffering is because of fear. Alternate translation: "I am suffering because I am so afraid" (See: rc://en/ta/man/translate/figs-metonymy)

the terrors of death have fallen on me

Becoming very afraid, or terrified, is spoken of as if terror is a thing that falls on a person. Alternate translation: "I am very much afraid that I will die" or "I am terrified that I will die" (See: rc://en/ta/man/translate/figs-metaphor)