Circe is referring here to the monster Skylla, but you can really apply her words to all forms of suffering. Pain, she tells Odysseus, is unavoidable.
Eurylochos considers starvation the worst death of all and prefers to commit a crime against heaven than suffer so.
Again, the message is to endure suffering as it can not be avoided. Of course, Odysseus will just be biding his time until he can deliver some serious (and seemingly excessive) payback.