I totally see the point here, but on a personal note, I've noticed something similar in my hubby (we're unvaxxed, unmasked, blah blah). His bout with Covid was really traumatic; we both thought he was going to die. He managed to stay out of the hospital and made a full recovery, but has had insane problems with heat ever since, which sucks bc we live in AZ. He literally gets something like heat stroke that lasts for about three days every time he gets too hot, even if it's only been an hour. Doc can't figure it out, and yes, there's part of me that wonders if it's mental. But it sure seems real and it affects our lives. So to say that it's not a thing at all seems a bit extreme to me.