First of all, Congrats!
I was banded on 10/6, so I'm a little ahead of you. I was not hungry for the first three or four days. After that, I got a little bit of an appetite, but a little Protein shake would satisfy me.
I added a little Fiber powder to my shakes to avoid the constipation thing. As for being a bit loose, you have to remember, you're only taking in liquids and most likely have been for a week or more. You may also have a lactose issue, especially if you are making your shakes with milk. A lactose enzyme pill can help with that.
Your appetite does come back, I am in bandster h-e-double toothpicks right now. I can't wait for my first fill. I was hoping to delay it until after the Thanksgiving holiday, but if my surgeon says I can have a fill tomorrow when I see her, I just may do that.