my sighing cometh before I eat - that is, prevents my eating [Umbreit]; or, conscious that the effort to eat brought on the disease, Job must sigh before eating [Rosenmuller]; or, sighing takes the place of good (Psa 42:3) [Good]. But the first explanation accords best with the text.
my roarings are poured out like the waters - an image from the rushing sound of water streaming.