Congratulations on your twinkies!
My little ones will be 19 months old on the 15th. Both are still co-sleeping and nursing.
I will be honest and tell you that the first few months are h*ll. Like you said, all you do is nurse, nurse, nurse and then nurse some more. LOL But then at about 3.5 4 months things just change. The babes get content to lay on a blanket so you can shower, brush your teeth, feel semi-human. They also start to sleep a bit longe, stay awake a bit more and their personalities just blossom.
I look back on those early sleepless hazy days now and wonder how we made it, but we did and we thrived.
It has to be hard on your little guy, I am sure. One thing that helped here was that when I was able to lay the babies down for a few minutes, I'd tell them they had to wait a minute as I was helping Jimmy, Boo, or whoever. It helped the younger ones to see that it wasn't always them being told they had to wait while I took care of the twins.
Keep a basket of books close by where you sit to nurse. Have you son sit by you holding a book, so you can read. Or just sit next to you and talk with him. When hubby is home, take your son for a short walk, even if it is just down the street a few houses. Have him be a dinner helper. Helping with meals is often a good time for chit chat, even with a little one. They can do easy tasks, or sit on the counter next to you while you cook.
I kept mine on the same schedule as much as possible for feeds. If one woke, I woke the other and within a short span, both started waking at the same time and got on the same routine. Although now they sleep totally opposite of each other! HAHA
I bathed them every night before bed to help relax them, rubbed them down with lotion for a little massage, and then nursed them both. It also helped relax me as I knew we were getting close to night time and some bit of sleep!
It is hard right now, but I promise, it does get better!