Covid was odd for me. My first time was pre-vaccination, I had horrible bone chills for 3 or so days and seemingly permanently lost my sense of taste and smell, but somehow never tested positive for it. The latter symptoms makes it either covid or just an enormous coincidence. Going ahead and assuming it was covid, as it was the worst I ever felt from any disease aside from a horrible food poisoning vomiting session.
Second bout was after getting vaccinated, and it was thankfully a walk in the park aside from pretty prolonged lethargy for a month or so afterwards. For that one, I was testing positive for almost three weeks, too.