oh, I couldn't have asked this better myself!! My son is almost 20 months, and we go through the same thing every night! Here's my advice that I will be taking soon: When he wakes up and starts crying, put your hand on his stomach, rub his face gently, things like this to "nurse" him without the boob. When I do this, my son will go to sleep within 2 mins, or an hour, it can take a lot of patience. I see where you wrote he won't stop crying till you nurse him, which means, he is interpreting this as "if I keep crying, eventually, she will nurse me". We have spent a couple of very long 4-6 a.m. moments with me refusing to give him the boob, and he does eventually fall asleep, even if it IS him lying sprawled across my body. keep in mind, this is not "crying it out", he knows you are right there and haven't left him, he is just in a habit, and habits are breakable with time. My husband and I are planning on (my husband) spending the night at his parents for a week (he gets up super early), so Eden and I can work on the sleeping all night without nursing situation. Great advice from the doc can be found on http://www.askdrsears.com/faq/sl3.asp. (-direct link to question)
they address this very issue with complete support. please let me know what worked for you! good luck!