Charles Ellicott 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 is come upon me. —The word for “anguish” occurs only here, and probably does not have either of the meanings given to it in the text and margin of our version. The Rabbis explain it of cramp, others of giddiness, and the ancient versions differ as to its sense. It indicates probably some effect of his wound which incapacitated him for further combat.