Not denying a phenomenon here, so the "Long Covid" moniker doesn't irk me, but I think you hear more "Long Covid" than "Long Flu" because of the lockdowns, masking, school shutdowns, and ongoing culture wars. I also believe the societal measures taken in reaction to Covid has caused a lot of mental anguish and illness that could be part of the "Long Covid" syndrome or phenomenon. Unless a very acute or severe infection was experienced with possible organ or lung damage, I am guessing a lot is the zeitgeist and general malaise of post-Covid modern society.
Thanks for that link. Very interesting. The role of social media in making patients an "epistemic authority" and reversing the normal arrow or flow from doctors and scientists. I like that "long haulers" came from a patient truck driver's cap!