Your own pillow if you have a favorite. Throat lozenges if you have a sore throat from the trac tube, again, very loose underwear and sleep bottoms. Maybe a fan to keep the air moving in your room. I got very warm in bed even though the room was cool.
Hydrate really well these last days, eat very light. Clear soups, broth, no salads or roughage, they take too long to digest. Ask about the scolapene? patch for behind your ear for nausea, I wish I had had it. I had a lot of nausea after the surgery and wish I had known about it. Had if for another surgery 6 months later and I felt great after that one.
Get up and walk as soon as possible and often to move the gas out of your system. Don't wait for them to get you up, page them and tell them you are ready as often as possible.
Best wishes, and see you on the other side of donation.