Is she teething? Cause DS is absolutely horrid when he's teething and he has been for most of the past 8 months. He is up at least 2-3 times a night, up for the day at 5am, maybe sleeps 90 minutes during the day if we're really lucky...

Night weaning may work for you - we did it a couple of months ago and DS still wakes just as much as ever but he doesn't always need me. It was VERY hard for a couple of weeks. DH had to do a lot of teh heavy lifting at night and there was screaming, I'm afraid. But he got used to the idea and things settled down again. It may not fix the waking, but might at least give you a break. Also, stopping feeding to sleep (which turned out to be easier than I'd feared) seems to have helped him too - he goes to sleep much quicker now.

The only other thing I can think of is more Shel time... you obivously need some more help.