I bet its just a 24 hour flu. Last saturday, i was frozen. Shaking cold. Literally shaking. Even with electric blanket. My skin ached. Really weird.
Puked..couldnt eat.
Almost 24 hours later, I felt 90% better. Stomach was queasy but i could at least function.
Tested negative 3 times at home and once at hospital on monday night for another matter
Hope you feel better