There is a very good documentary on Netflix I think called “diagnosis” a doctor who does a column for the NYT crowdsources For patients with unexplained undiagnosed, wrongly diagnosed illnesses . Which brings medical professionals around the globe to weigh in. Each episode follows someone different. There was maybe 2 people where is was really psychological. The others actually found real diagnosis and treatments . It’s pretty amazing. I agree, just because I doctor can’t diagnose it does not mean it doesn’t exist or isn’t real.
As far as COVID ...... our Chief medical officer who just retired came to do a Q&A on the covid vaccine on our unit. His specialty is infectious disease. He said there is a lot we can’t answer and there is a lot we don’t know because this has been around for only a year. I believe in the symptoms of long haulers. COVID wreaks havoc on the body, differently than any other virus we have known. And there is so much more to study and know that we won’t have answers to for years