I had something very similar about two weeks ago. I was just finished with a 4 month stint of various antibiotics and I was feeling pretty good. I went out and filled all my prescriptions for Babesia treatment, but decided I would wait to see how I feel off the meds before I started the Babesia meds.
I went about 8 days feeling pretty good, then woke up the next day twitching like crazy and a low grade headache. By the end of the day, i had a 103 temperature felt like death and had major headache, sweating, bad sore throat, sinus pain and pressure.
At that point, I started my Clindamycin and quinine and the symptoms faded away over the next few days. Felt just like strep throat or a bad sinus infection. Guess it was stupid not to stay on the antibiotics.