29 yr old male, fever (highest was yesterday with 102.9) now it's been around 101.6 when I take tylenol or motrin. Switching on and off w/tylenol & motrin every 6 hrs. Once fever is back I get very bad headaches and neck pain. I've had a fever since Thursday (4 days now). Drinking plenty of fluids, and I have been exhibiting nausea, body aches (when i have fever), sleeping a lot and feel lethargic, and vomited last night. I was given Tamiflu in case the rapid test was incorrect. Urinalysis sent out yesterday, I know I had trace of blood in urine but she doesn't think it's a kidney infection. Help. If it is the flu how long can it last?