1)
What are "Chevlei"?
1.
Rashi citing Targum Yonasan: Camps. This is like Chevel Nevi'im (Shmuel I, 10:5).
2.
Radak: They are pains, like "Chevlei Yoledes" (Hoshe'a 13:13).
2)
What is the meaning of "Kidmuni"?
1.
Rashi: Came in front of me.
2.
Malbim (Tehilim 18:6): It is as if I already died, and I was awaiting burial.