CAT Scan: clear. Now what?

I stopped by the allergist's office this morning. As he entered, the nurse caught him to discuss my case. "Bring her back to an exam room..."

My CAT Scan showed nothing. My sinuses are fine. My allergies are behaving themsleves. So WHY am I still running fever? We discussed various possibilities, but I need to go see my primary doctor for more tests.

Currently, it is 78 degrees in the house. I'm running 99.4. I'm so tired of this.