[user104658]

Is it massively different To “standard” post-viral fatigue syndrome? You can get that after many viruses though it is quite rare, and still not well understood. The symptoms sound more or less identical so are they just using “long COVID” to describe PVFS post-COVID?

The immune system does weird crap sometimes. I had a nasty unknown virus about 5 years back, and then some bizarre post-viral think for about 6 weeks after. Exhaustion, random stabbing joint pains, and the weirdest was that my temp would spike EVERY NIGHT at about 3am (I would wake up sweating like crazy and physically hot-to-touch) and would have to take a cold shower or press my whole body against the cold external wall that was next to the bed (a technique I developed after getting sick of showers in the middle of the night) to get back to sleep. Then I’d wake up in the morning fine. Went on for well over a month, it was so odd.