1)
What is "Amali"?
1.
Ibn Ezra: Every Amal In this Sefer is exertion of deed, like "Asher Lo Amalta Bo" (Yonah 4:10). It is unlike "Aven v'Amal Tabit" (Chabakuk 1:3), "v'Rahbam Amal va'Aven" (Tehilim 90:10).
2.
Rashbam: My wealth.
2)
Does he hate only the toil that he will leave to others?
1.
Rav Sadya Gaon, Ri Kara: I hate all my toil, because I will leave it to others.
3)
Why is he pained that he will leave it to others?
1.
Seforno: I pain myself over a world that is not mine.