I haven't read K.A., but I think that that would only account for a certain subset of the visions: possibly some of the ones where the sufferer is described as lapsing into unconsciousness.

I dunno. So many of these visions seem to have acoherent theological prgramme at the back of them that I'm reluctant to put them down to being *merely* pathological (though a lot of the millinarian tendencies prbably are the result of ergotism...)