It's hard, I know, but try and enjoy your friend's baby, even if you have to put off your first visit to get your head straight.

Especially if there's noone else, try talking with your DH more. Blokes are great at shutting down when things upset them - no doubt this is hurting him too, but he probably wants to put up a strong front to help you (it doesn't help of course). It's really important to keep the lines of communication open (and I'm speaking as someone who isn't very good at doing that).
Take care of yourself and your family