Co-sleeping Nurser

I recently found out we're expecting #4 (yay!) wasn't really expecting it with my PCOS making it hard. Any way I have a 22 month old co sleeper who still nurses. I know I can continue but, I think it's time to break both habits before Little One gets here in Jan. I have tried the cry out method and I can't take it. I've put spicy stuff on my nipples (ouch! btw) to no avail. I've placed him in his bed and he wakes and comes to ours. Let me say, I never nursed the other 2 as long or ever had a co sleeping child before him. Any suggestions?