Hon, you're fine. Can you take your temperature to see if you do have a fever? if you were screaming out orders all day, like you said, that's why your throat is sore. Are you lifting up trays of food or just a few plates at a time? If you're not use to waitressing of course your body is going to rebel. Waitressing isn't easy physically and dealing with customers all day I'm surprised you don't have a headache.