Your son obviously likes sucking your breasts, and he will not freely give up that pleasure. It might be better if his father, or some other person, who the child feels secure with, takes care of him when he is tired, until the worst crisis is over. Otherwise, you will not be able to withstand his crying, and there is a great risk that you will yield to his demands. It is best for you to be so far away that you cannot hear him. Thus, weaning can be much easier if the dad also handles the tucking in at night, instead of you doing it. There will then not be any discussion. In this way there is no breast to suck on, and finally the boy will get tired and fall asleep.
When he is accustomed to go to sleep without breast feeding, then you can go back to handle the tucking in for the night.
It is important that you avoid problems with your breasts if you stop breast-feeding abruptly. You may have to milk your breast dry yourself the first few days. Discuss this with a midwife, if you can. Even if you have decided to stop breast-feeding, you should expect that not only your son, but also you will feel sad for a few days.