I completely feel for you, S.! I just managed to wean my 21 month old son and the best thing that worked for us was a change in routine. This might be a good time to move him to a big boy bed if you haven't done that already. We found with our son that this small change was so exciting he occasionally forgot to ask to nurse when he woke up (for us it was the mornings that were the last to go). The other thing is to change the bedtime routine. Maybe having your husband read him some extra books before he puts him to bed, or something else where YOU are not in the picture (say goodnight to him, but then leave the room and let dad take over) would help?
With us we were able to skip every other day or so for a while, then a few days in a row, and finally, after about 3 weeks of having stopped, he stopped asking. We still do not get our morning in-bed snuggle because he associates that with nursing and I don't want to remind him of it. But I found that as long as he wasn't put into a situation where he thought "oh, I get mom's boobs now" he didn't really think of it because there were more interesting things to do.
Good luck!