This speaks of a person mourning throughout his life as if he always ate in darkness. Here "darkness" represents sadness and mourning. Alternate translation: "He spends his life in mourning and sadness" (See: [[rc://en/ta/man/translate/figs-metaphor]])
The words "sickness" and "anger" can be expressed as adjectives. Alternate translation: "suffers greatly, being sick and angry" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])