I was banded on Thursday. The whole time I was in the hospital, I felt great! Just sore from the band area and incision site. When I got home? Not so much. I've been having a tough time with pain, also a hard time getting liquids in. Forced down 2 Protein shakes over the course of the day yesterday in very tiny sips. Took 2 hours to drink one. I am having chest pain when I swallow, and I think it's just because it's so tight in there from the swelling.
As for the 10 lb weight gain, I weighed myself when I got home too and it said I weighed 6 lbs more. I weighed again this morning, and it's back to what I weighed the morning of my surgery. I think it's Water weight from the IV... they really keep you "juiced up" in the hospital so you don't dehydrate. Give it a couple days and weigh again. You KNOW you didn't gain weight during that time... just let the swelling go down and you'll be fine!
Good luck!