Albert Barnes Commentary Daniel 10:17

"For how can the servant of this my lord talk with this my lord? for as for me, straightway there remained no strength in me, neither was there breath left in me." — Daniel 10:17 (ASV)

For how can the servant of this my lord - Acknowledging his humble and lowly condition and rank in the presence of an angel - a messenger now sent from heaven.

Neither is there breath left in me - That is, he was utterly overcome and prostrate. He felt that he was incapable of speaking in the presence of one who had descended from God.