I had DS surgery this past January and all of a sudden my appetite has increased and I am very hungry and am able to eat a lot more than I was...is this normal?
That may depend on what you are eating. If you are eating lots of carbs,then yes,you likely will be more hungry.
Not getting 64+ oz of fluid a day? Then that. MIGht be making you think you are hungry,when your body. Is begging for hydration.