Your last comment is certainly valid enough. I've seen the claim that "long Covid" might in fact be psychosomatic. That to me, reeks of the fallacy of the false dichotomy. The world is a complex place. Wouldn't it be more reasonable to say that "Long Covid" may really have some truth to it? That still allows for a significant number, perhaps even a majority, of claimed cases of being psychosomatic. It's a well-known problem in medicine and psychology that various diagnoses and treatments rise and fall in popularity. For example, in recent years diagnoses of bipolar, ADHD, etc. jumped. I'm just a layman, but I do not doubt that those syndromes really exist. But if there is a rapid increase in claimed cases, isn't it possible that we were witnessing an epidemic of diagnosis, not necessarily a true malady?