en_tn_lite_do_not_use/psa/043/001.md

the God of my strength

AT: "the God who gives me strength"

thrown me away

The author feels that God has rejected him and compares it to being thrown away. AT: "rejected me" (See: rc://en/ta/man/translate/figs-metaphor)

Why do I go mourning

To go mourning is to perform customs related to being very sad.