3 days ago, my daughter woke up with nausea and felt hot like she couldnt get cooled off. She has not had a fever at all. She has also had a headache off and on during these 3 days. Yesterday she seemed to be better and I didnt hear any complaints from her. Then this morning she woke up with the same headache in the front of her head and nausea. She has vomited once this morning. She does not have any sinus symptoms. I am worried and do not know how to help her.