The prophet suddenly assumes the language of the Jewish state personified, lamenting its affliction (Jer 10:19, Jer 10:20; Jer 9:1, Jer 9:10; Isa 15:5; compare Luk 19:41).
at my very heart - Hebrew, “at the walls of my heart”; the muscles round the heart. There is a climax, the “bowels,” the pericardium, the “heart” itself.