You need to report the nurse to the administrator. There is no excuse for behavior like that. You are allowed to, and very wise, to ask as many questions as you want! I am super sensitive when people snap at me and I start second-guessing myself. Don't take on her junk! You have enough to carry around. I don't know why people just cannot be nice, it's not that hard! And in her case, it's part of her job!