Both times I had COVID I went from "worst fever ever / my body feels like I've been hit my a bus" to "I have a pretty average cold" in less than 36 hours. Utterly bizarre. (Vaccinated, good health, 40s male)
Edit to clarify: I didn't take anything other than paracetamol and ibuprofen.
I did not take anything special either, vaccinated, and have had more or less the same experience. I got from not being able to even sleep the night due to the pain, to feeling great the very following afternoon. Completely bizarre. None of the people I know experienced it like this, though.
This is why properly controlled trials are needed for stuff like that. It is easy to attribute the change to whatever random thing I tried at that point out of desperation.
Edit to clarify: I didn't take anything other than paracetamol and ibuprofen.