It's an interesting question. Maybe creating a ritual to mark the final journey can help calm the nerves and provide symbolic footholds to guide your actions.
Now as for a last meal, I think I'd like something simple but tasty. Maybe some capellini pasta with a simple marinara sauce, a small salad, a small glass of Merlot or Pino wine, followed by a delicious slice of pecanpie topped with a rich gob of real vanilla bean ice cream.
I haven't had much of an appetite lately, but damn if I'm not suddenly ravenous. It's the pecan pie. Always the pecanpie.