R.,
First, kudos to you for nursing twins! I'm sure it is hard work, but what a wonderful thing you are doing for both of them plus yourself.
I nursed my son exclusively the first 6 months, and he had *horrible* gas and screaming fits for the first few months of his life. I remember many days at the beginning when I would stand holding him or rocking him, all the while tears dripping down my face while he cried and squirmed in pain. I was convinced it had to be something I was eating, since all he was getting was my breast milk, even though so many doctors will tell you it isn't related to what the mother eats.
I went on a mission to figure out what it was, since I had to focus my energy somewhere to help my son who was in so much pain. It took months to eventually figure it all out -- but it was ABSOLUTELY related to what I ate.
As others have mentioned, dairy was the number one culprit. Cutting that out COMPLETELY, in all its forms, my son got about 60% better. It takes up to 5 days for all the dairy proteins to leave your milk, so you need to be patient. Since my son was still in pain, I continued to believe there had to be something else in my milk that he could not digest. Sure enough, after eliminating many foods, he also got gas when I at nuts as well as soy. When I completely cut out all dairy, soy, and nuts, he had zero gas. He was a completely different baby.
I won't sugar-coat it. It was *very* hard to cut all those foods out for a long period of time. But having a happy baby made it all worthwhile. At 7.5 months, I was able to eat dairy and nuts without it having any effect on my son. So, rest assured, many babies have food sensitivities that they outgrow the first year, once their digestive system is more developed.
At 10 months, I am still nursing and he still seems to be sensitive to soy. I test it by eating a food with soy in it every month or two.
I'm sure you can figure out what foods are bothering your sons with some diligence and patience. I put together a list of all the possible foods I had read could bother a baby and worked my way down the list. If you'd like the list, please private message me and I'll be happy to send it along and help you in any way I can. Keep up the great job nursing and hang in there. It WILL get better!
Warmly,
L.
P.S. Throughout my investigation trying to figure out what foods my son was sensitive to, I did use Baby's Bliss Gripe Water on the really bad days when I needed a break. Half doses worked great for us. Note, though, that if you use this it will mask the sensitivity of any foods you are "testing" for a reaction in your sons. The gas will temporarily clear with the gripe water and will come back once he drinks more of your milk with the problematic foods. So be aware of that if you try to use it in conjunction with removing foods from your diet.