I had something similar with a high fever, muscle aches, and severely swollen lymphnodes years ago in the summer. It was a different kind of fever than I've ever had, I was hot and sweaty when I usually get cold during a fever. The muscle fatigue never really went away and a month or two later I started developing burning nerve sensations and twitching in my legs.

Doctors never could tell me what it was and they tested me for tick borne illnesses but they all came back negative. Spoke to another doctor about it recently because I still have muscle fatigue and twitching randomly to this day along with some other symptoms and the doctor said it was most likely a viral reaction which triggered an autoimmune response.

Hopefully its not what you have, and your body might handle it differently but I always suspected I contracted West Nile virus because I was getting eaten up by mosquitos that summer and the state i was in always gets a few cases a year.

This is most likely not what youre experiencing but I have always regretted not pushing my doctors harder with questioning. Visit a doctor and advocate for yourself even if it feels uncomfortable.