No idea what it was (never had a headache/fever or respiratory issues), but felt like complete crap for the past 72 hours...full body ache, stiff joints, zero energy, wanted to just sleep but would then wake up every hour or 2. Feel normal again as of this morning.
Could be a mild flu. The two times I have had COVID though it started with feeling very tired at first and then feeling feverish.
That's how mine was. Whole body hurt and was so miserable. Rest of my family got it but symptoms were different for them.
I didn't take any sort of test because it really made no difference. If it got bad enough I'd go to the hospital no matter what it is. There's all sorts of crap going around here now that school is back in session. Anecdotal: my mom's hair salon said they cancelled 27 appointments in the past week because people are sick.