I'm going through a similar stage, but just night-weaning my nearly 20 month old. We're at the stage where she'll go to sleep without boob now, but lots of cuddles (and I have to be standing up ), first few nights were good, just cuddles and she'd be back asleep within about 5 mins. But the last week has been shocking, and I keep giving in as well
Have you read The No-Cry Sleep Solution for toddlers and preschoolers? I've found it brilliant to refocus myself ( haven't picked it up in the last week though - maybe I should!). It's got a chapter on the nightime nursling - heaps of really good tips. Let me know if you want and I can post some here or PM you.

Good luck - I'll be thinking of you at 2 o'clock tomorrow morning when I'm up with my little darling