Just to clarify this, because cant find it from the Faq now...

If character goes insane, does it discard his/hers attachments? If so, does it discard all of those, or are there something that does not go away?

On page 14 of the rule book, you will find the section on Insanity:

When a character goes insane, it is flipped facedown and all cards attached to it are destroyed .

I'm not aware of any cards in the current system that override this, so indeed all attachments are destroyed.

Oh god dammit! It was really so close again =D

I was only trying to do some research from the faq and there is some confusing part about Attachments and Attached Cards. Something that I have re-read again to understand, what kind of card would change it type, that all cards attached on it, would be discarded?

But yeah, thanx Prof again, you were really fast this time

Guardian Pillar is a location but then it's a character, and then it's a location again.

Tear Gas (TTftS) is an Event that becomes an attached card.