Albert Barnes Commentary 2 Samuel 1:9

"And he said unto me, Stand, I pray thee, beside me, and slay me; for anguish hath taken hold of me, because my life is yet whole in me." — 2 Samuel 1:9 (ASV)

Anguish — The Hebrew word used here occurs nowhere else in Scripture and has a doubtful meaning (compare the margin). The rabbis interpret it as a cramp or giddiness.