1)
Why does it say this his Tefilah will come in front of Hashem?
1.
Malbim: The Tefilah is personified. It is as if it rises and stands in front of Him.
2)
What is "Rinasi"?
1.
Radak: It is my Tefilah. The same applies to "va'Ya'avor ha'Rinah ba'Machaneh" (Melachim I, 22:36).
2.
Malbim: It is my lamentations about the afflictions of my body.
