From my heaviness, i.e. from that mournful posture, Ezra 8:4, and put myself into the posture of a petitioner. Or, by reason of my heaviness, or affliction. Having mourned for the sin, I considered that was not sufficient, and that God expected the confession and amendment of it, and therefore I fell to prayer.
Related Commentaries of Ezra 9:5
Ezra 9:5
5 And at the evening sacrifice I arose up from my heaviness;a and having rent my garment and my mantle, I fell upon my knees, and spread out my hands unto the LORD my God,