Feeling hungry is something you will get used to . ..having a band doesn't automatically stop you feeling that. Drink plenty of water etc to keep yourself hydrated, but speak to your provider . . .its early days, thicken milky coffees by whipping up/frothing your milk, same with milkshakes, if you blend them with crushed ice, again it makes them thicker so you stay fuller for longer . . .
Thin down little custard (low fat) pots with milk to make it a thinner consistency, but it gives you something to "eat" rather than drink . . fill up on cup a soups if you're feeling hungry . . .but, that hunger is often there even with fills . . .having a band or a fill doesn't make that go away per se.