Multiplicity

Is it normal for a split to fear death in face of integration in the same way its 'normal' for a singlet to fear death when their head is on a chopping block?

Like kangetsuhime said, if you're talking about someone who actually was split from a pre-existing self, they might be happy at the idea of being re-merged with their 'original'-- on the other hand, they may also feel that they've grown beyond being a fragment of another, that they've developed into their own person, and see integration as meaning the loss of the self they'd become. Of the systems we've known with members who did originate by splitting in the classical sense, many of those had grown and expanded in the subsequent years, and didn't think they could be put back together with others any more than twins could be put together into a single person.

Is a 'being' post-integrated a reliable source to explain what happened to them? Are there any post-integrates willing to explain what they've figured out about it in the sort of language I've gotten used to?

I think some of them are reliable sources. There's a book called "Beyond Integration" which discusses it. On the other hand, I've run into some multiples who claimed to be integrated who struck me as being simply in denial. I tend to trust the ones who don't push integration as being What We All Must Do and accept and respect the choices of those who don't want integration.

I know personally of three systems who either integrated or had everyone except for one person leave. I'm not sure if it would be violating their privacy to give webpages and/or LJs for them, so I won't give their names for now.