1)
Why does it say "ha'Al Eleh Sis'apak"?
1.
Radak: How can You hold back over these, and not have mercy?!
2.
Malbim: Via You holding back, we are far from salvation of the Nefesh. Why are You silent?
2)
What is the meaning of "Techesheh u'Se'anenu"?
1.
Rashi: You are silent about what is done to us. Until here is the Navi's Tefilah.
2.
Radak: You are silent, as if You do not hear our screams, and we are Me'unim (afflicted) in the hands of enemies.
3.
Malbim: Your silence (not answering my words) is a great affliction.