Hello!
You’d have had your procedure by now I think so my reply will probably be useless but I took:
Tablet, my own pillow for comfort and to hold against your chest on the way home, button up pyjamas, baby wipes, toothbrush and paste, easy wearing shoes. I stayed for two nights and travelled really light, make sure someone carries your bag for you when you leave, you won’t want to!
Good luck, it’ll change your life.