1)
What is the meaning of "Elecha Chisisi"?
1.
Rashi: My travails - I cover them from all people, to tell them [only] to You.
2.
Radak: I screamed to You hiddenly, covered from people.
2)
What is the connection of the two halves of the verse?
1.
Radak: Save me, because I did not reveal my quarrel to people, for salvation of man is vain.
2.
Malbim: Save me from my enemies who sit on the road to ambush me, for I covered my way from all people. Only You know my place. You cover my secret that I revealed only to You.