This thread has taught me nothing. It’s been a total waste of time. It’s as though the condition does not exist but I know it does.
Nobody has said "this condition" doesn't exist.
There is disagreement about causes, and also about the standards for diagnosis, on a poorly defined syndrome that has a wide range of symptoms of varying severity.
If your mind is already made up, though, I guarantee "taught me nothing" will be a frequent occurrence.