Started with a sudden vomiting spell that kept me up all night, and a high fever. Couldn't keep down fluids, so I let my stomach empty. Next day had some gatorade and eventually soup. The vomiting stopped, but the high fever lasted. Fever was about 20 hours total, accompanied by chills and body aches like a mild flu. Kept temperature down with a dose of Aspirin & later a dose of Tylenol. Went to clinic, they did flu test which was negative, and said I didn't have strep, that it was likely just a virus. Next day, I feel 100% better...except I've urinated twice and it's dark brown and has an odor. Is this just my system cleaning out or likely an indication of a problem? I have no pain, and no fever. I have a copper IUD so I'm a little worried about infection in my urinary tract.