https://en.wikipedia.org/wiki/Chronic_fatigue_syndrome
Long covid is a variant specifically from covid-19 infection. I have fibromyalgia which seems related in some way, although male sufferers are rarer than women.
They encapsulated a variety of similar conditions under that term but there are a lot of varieties that share common things as listed and then the specific things as well. I would imagine that Long Covid would indeed fall under that.
I got tested, I had the flu and I have a serious chest infection as a result. Since I have this condition plus a scared up lung from when it collapsed it has been rough
Fibronyalgia is also a range of issues that have similar conditions but cannot be specifically tested for. They actually did a whole load of tests to rule out all the things they know about and then labelled it. Which isn't that helpful as mine appears to be genetic and still getting worse.
People can survive with only one lung, but look after yours. For that matter get the vaccine every year too, I do and even paid for it when I had to. When offered the covid vaccine I accepted instantly, second jab 6th June.
I normally do get the flu jab and was planning too as it is now autumn it has just started to be offered. Australia has had a few years of getting this years variant wrong and initial jabs early on not effective so you give it a few weeks.
3 years ago I got my jab and got the flu 3 weeks later and then a few weeks after that they said the entire jab wont work this year, got it wrong, sorry, lol.
Lung wise - Yes, no sky diving and all that And I do because if it collapses again they will have to glue it to my rib cage