Marlene.
(And LOL at your little comment under your username - man, I can relate to that!
You're right, wait it out. No doubt there's some sort of developmental 'shift' going on there. I remember at 4 months Natty's great sleeping turned to crap. It is soooo hard. I know you said your DH is useless (and I understand, LOL!), but is there someone else like a parent or friend who could help you out for a couple of hours so you can catch a little nanna nap one afternoon or something?