Toddler help

First child, not sure if it’s normal but I have anxiety about everything, so I’m coming here again to maybe calm me down. And I’m sure it’s a stupid question, but I have no idea….

2.5 year old has hit the terrible two stage. Screams at naps. Screams at bedtime. Eats when she feels like it and some days it’s not even that much. Will mostly drink her milk, apple juice, and water on a consistent basis. Is it normal to just survive on rage and milk? Any tips?