My 20 year old daughter is at college and is having heart rate of 100, fatigue with walking pain under rib cage, fever on/off of 100+. this has been for over a week, also is very thirsty at night. She went to the ER and they said it might be the flu, did a urinalysis and sent her home. She is seeing a NP today, I would like to know what tests they should run. she is a healthy active person normally with no medical conditions.