This from The Daily Telegraph:
" Scientists have been investigating the cause of the short-term illness since it was first reported in 2001.
Now China – which supplies most of the world's pine nuts – has admitted some exporters have been mixing the Pinus koraiensis variety with the cheaper but inedible Pinus armandii.
The latter are deemed "unfit for human consumption" by food safety experts at the European Commission but the lack of long-term harm means regulators have stopped short of a recall or a ban on imports. "
Cheap Chinese pine nut exports blamed for rare condition - Telegraph
I have been eating the pine nuts for years but never had this bad reaction until now I think the quote above explains things pretty well.