I had a query already. My daughter, 3 years, had sudden on and off mild fever from 10PM last night till early morning. No fever at all since she woke up in the morning. Vomiting/ feeling nauseous/ spitting saliva often since she woke up. Is it due to acidity? She had a mild breakfast; still she says she feels like vomiting, but not vomiting and only keeps on spitting saliva. She is normal and active otherwise.