1)
Why does it say "Ekra Yom"?
1.
Rashi: I cry to You day after day, [and You do not answer]!
2.
Malbim: I call the entire day.
2)
What is the meaning of "v'Lo Dumiyah Li"?
1.
Radak: I have no silence from my scream. Dumiyah is a noun, and not an adjective.
2.
Malbim: I am not silent for a moment [from screaming at night. Why do You not answer?!]