Congrats on your surgery! I am day 7 post op, I had the sleeve done by Dr Ariel Ortiz @ the Obesity Control Center. First of all you want to pack light you really don't need much. You will need some comfy clothes for when you are back at the hotel. Your toiletries obviously. A lot of people have heating pad on their list but most surgeons in MX use glue instead if stitches and the heating pad will just melt the glue. The things that I know I was very grateful to have are...
Gas x strips - absolute must
sugar free werthers candies - another girl gave this to me in the hopital after surgery and it was like the nectar of the gods to me lol
ramen noodle flavor packets - just in case
Chap stick
hope this helps ... good luck!!