Not really sure, since I can't see the pictures full size, but my hunch is that your plant isn't sick, it's just DONE. Well, not totally done, but it's finishing, and that involves taking the energy that was in the fan leaves, and putting it into the buds. Nothing to get all bummed out about... Go look again at irydyum's logs. I think that's where I remember seeing pictures of a plant with all the yellow fan leaves. Some plants do that more dramatically than others.

How long has this one been flowering?