A:My eldest did not sleep through the night until after he was 2!
I tried putting him in his crib and letting him cry it out - once. Once was all it took, because some unknown neighbor (IN ANOTHER APARTMENT BUILDING!) called the police on me. After that, I was afraid to try it again; so I just took him into bed with me and nursed him while we both fell back asleep.
I feel your frustration. I feel your exhaustion. I have been there.
Try www.breastfeeding.com; it's a site by moms and for moms and I'll bet you might find this topic addressed on their 'Forum' page.
Good luck!