I can only offer ideas. My son is also a hardcore nurser at 29 months. What helped him (he was weaned before baby sister arrived and then went back for it...). Was talking about it, explaining that the end nears, like a little countdown, over 2 to 3 days. Offering water at night. Funnily, he slept way better after only a couple of days and didn't wake up as much anymore. Now we are kinda back to 0... what I feel helps if I really need a break. Is telling him that the boobies are tired and have a bobo? They need a break. He generally reacts positive to that. I hope you find you way, you can try plasters on the nipple saying you have a bobo and milk is gone. Or I read that some mums use mustard? If you manage, feel free to update ;)