A.H.
The "Baby Whisperer" book was very helpful to me. The author believed that any habit can be broken in 3 days. I clung to that advice when getting my daughter to sleep and found it to be completely true. You can't necessarily get your son from several feedings through the night to nothing in 3 days, but set a small goal - like you will nurse but cut it a few minutes shorter than normal. By the 3rd day, he'll be ok with the change and each change after that will go easier and easier until soon he is on a schedule you can live with. You have to pick the change that makes sense. And remember - all you have to tackle is 3 days at a time!
Also, a friend of mine would offer a bottle with water in it. The child would take it and decide he didn't want it and go on to sleep. That did not work for my child - she right through that and just screamed, but every child is different!
Also, you don't say if you have someone else in the home with you. When I was backing my daughter off nursing in the night, ONLY my husband could get her to go back to sleep. Once I entered the room it was all over (in terms of her crying til she was nursed). After 3-5 days of not being nursed at night, then I could go back in and comfort her and it would work. Pick a weekend to tackle this problem so everyone can get some sleep the next day!