Why does it say "Oy Li Al Shivri"?
Radak: The Navi discussed punishments that will come on other nations. Before that, woe to me for Yisrael's fall; they are stricken first.
Malbim: There are two Chesronos to my fall. (a) The external breakage. (b) An inner wound; it is very ill.
What is the meaning of "Nachlah"?
Rashi: It is an expression of Choli (illness). Radak - it is a severe wound. I thought that I can bear it, but I cannot, for my tent (Yerushalayim) is plundered.
What is the meaning of "Amarti Es Zeh Chali v'Esa'enu"?
Rashi citing Targum Yonasan: [This is my illness;] I will bear it.
Malbim: I thought that I have one particular illness, and I can bear it. However, I see that I have many illnesses (like the coming verse discusses).