Any ideas on how to reduce a persistent fever?

I have a persistent fever that won't go down with medicine. I work nights so when I got off work Friday morning I felt chilly so I took my temperature, 101 degrees, I had a sore throat all night at work but didn't think anything of it. I took some ibuprofen and went to sleep. When I woke up the fever was gone and I was drenched with sweat, so I know it got to the breaking point. I didn't have a fever from when I woke up at five until about 9 30. It was 99.5 I took some tylenol this time and waited a few hours, took a cool bath and took it again about 1230, it was 100.8 again, I took some ibuprofen and checked it about 230 and it was 101 degrees. Any advice on what I should do without have to go to the doctor (last resort).