1)
What stood him on his legs?
1.
Radak: When He spoke to me, the Ru'ach came to me and strengthened me and stood me on my legs.
2.
Malbim: After his senses and powers were Batel when he fell on his face, he merely heard the voice, but could not understand. Therefore, the Ru'ach strengthened him and stood him on his legs. Then, he heard and understood.
2)
Why does it say "Es Midaber Elai"?