.. I've got it.
Not about childbirth, or even having the responsibility of a new born baby - despite those things being the biggies - but about work and careers, money (lots about money), the death of ambition.
It's only come on in the last week or so (24 weeks pregnant now), but I'm beginning to think that it's going to affect my sleep for some time to come.
What can I do to help myself? Have you had the fear? What made it go away?