Did you actually take your temperature during this? and did you have one?
What you describe sounds familiar to me, I've definitely had an overall feeling of being ill, especially after a hard working, stressful day. And had fevers that would come on suddently and caused shivering so intense, there's cramping. It's pretty painful.
It was quite a long time ago, but I recall it was when my temperature was rising rapidly and I ended up with a 104 degree fever. In the first few years after I was diagnosed, and flaring pretty much constantly, one of my most frequent symptoms I had with the joint pain, was fevers. In fact, I used to get them every afternoon and they'd last thru most of the night. Then break by morning and I'd feel better.
Really sorry this happened to you.....hope you can get some rest tonight.