I am nearly the same for wt loss at 13 days post-op. I lost 10 on pre-op liquids and 5 at my 1 week post-op weigh-in. I too am not taking in much nutrition, ab 400 calories, ab 45gr protein and 40oz water. I intend to increase my protein and water as much as I can, but it is hard to do. We have to hang in there and keep going.
I am consuming some pureed cottage cheese, pureed tuna and avocado, and ricotta bake - small small amounts. As well as a shake and some Isopure clear protein drink.
And sf chocolate pudding did not sit well at all - so that is off my list - who knows why.
Your hunger could be acid reflux. I am def NOT hungry, could care less about food - but not fond of passing out either lol.