Why does it say "ha'Lo Fesa Yakumu Noshechecha"?
Radak: Did you not think, in your pride, that you will be in the grave, and suddenly will rise those who bite you, i.e. worms?!
Malbim: Those who take Neshech (Ribis), they will claim from you the Ribis that you owe.
What is "va'Yiktzu [Mezazecha]"?
Rashi: This is like va'Yakutzu (they are repulsed).
Radak #1: It is as if they slept, and when you came, they woke to rule over you, to shake you and shatter you into pieces. The Yud of the root {Yakatz} is omitted.
Radak #2: "Noshechecha" and "Mezazecha" apply to Belshatzar, Nebuchadnetzar's grandson. Melech Pras' army came suddenly to Bavel and destroyed Bavel.
Malbim: Your creditors will waken and agitate you to pay also the principal.
What is the meaning of "v'Hayisa li'Mshisos Lamo"?
Radak citing his father, Targum Yonasan: They will pillage your flesh. This is like "Mi Nasan li'Mshisah Yakov" (Yeshayah 42:24)
Radak: Nebuchadnetzar was cast out of his grave, like it says in Yeshayah "v'Atah Hashlachta mi'Kivrecha" (refer to Yeshayah 14:19:2:1).
Malbim: When you will not have what to pay [your creditors], they will pillage you. This is the Nimshal ? after this, it explains the Mashal.