I remember they mostly had questions for me... About the episodes. Then based their judgement from that. I don't suppose they are infallible, or anything... But, good enough, I suppose.

I mean... I guess a 'litmus' test (in some sense) would be some kind of a head scan... Only... Maybe not... Because I've heard that people with back pain... Some of them had disk abnormalities on MRI... But some of them don't. And of people who don't have back pain... Around 20% of them do have disk abnormalities on MRI... So... We are inclined to say that disk abnormalities cause back pain... ONly lots of people have simlar disk abnormalities but no back pain and lots of people have back pain but no disk abnormalities on MRi...

Brain scans are kinda like this, too...