Hell, the idea that "the original person is gone" is pretty much the way zombies have worked in all forms of fiction, the zombies are purely active corpses with no awareness or real personality of their own.
That's not true. Many zombie stories involve somebody coming back for revenge or some similar specific purpose (e.g. EC Comics). And there was also Simon Garth, who not only retained his human mind, but became a better person.
As for what I would do, I'd go a little Lovecraftian. I'd find somebody to hypnotize me into retaining my consciousness and personality after the change. If it worked, I would become a major asset to the group. If not, they could just kill me.