Not sure, though I've just spoken to my FiL and he gave me a hugely long and considered stream of medical stuff. He's going to jot it all down and send it through to me in a bit once he's had a chance to conference with a friend of his.
The gist is though, he's wondering if she's had some sort of viral infection that has knocked her a bit, but there are a few tests that he's going to suggest. Oh and there were a couple of terms he didn't understand and he'll say what they are. Segurado I think was one of them.
I'll e-mail it through as soon as I get it from him.
Oh and by the way, he hates "House" as they always do 10 tests where 1 would do!