Hi K.,
I had a very similar problem, but didn't have the quality medical expert you seem to have, so I had to figure it all out on my own. I would highly recommend you follow his recommendations as you are very likely to benefit healthwise, as you continue to breastfeed your babies, who will definitely benefit from the breastfeeding. We knew my first son was allergic to milk, as he was in ICU. I didn't learn about my own milk allergy until he was two, but fortunately before my second child was born. My first child was just like your daughters and we just suffered through it. My second child was the happiest baby ever. We did later learn that he also had a milk allergy, but since I had no milk in my diet, he did great (he did have problems if I had broccoli or any cruciferous veggie or orange juice). I felt better with these dietary restrictions.
We only later learned that we also all three have celiac disease (gluten intolerance) and I would highly recommend you get screened for that. It is an autoimmune disease with a genetic basis and it can often be the cause of a leaky gut that is what leads to these other food allergies. Gluten (found in wheat, rye, oats and barley) damages the intestine and allows proteins that shouldn't be in the bloodstream to be there, thus you get these immune reactions. Celiac disease is highly underdiagnosed. And, yes, the dietary restrictions are tough, BUT it is well worth it for the health advantages. I've been a highly restrictive diet for almost 4 years and it does get easier over time. There is a restaurant in Plano, Delicious-n-Fit that can cater to your allergies - it's entirely gluten-free and she can accomodate additional allergies (my family also restricts soy and dairy). I also have to restrict egg, yeast and many nuts.
I would be happy to answer any additional questions you have: ____@____.com. I have learned alot on my own over the past 4 years in dealing with these dietary restrictions (I've been off dairy for 12 years) and am very happy to share my experiences. You may also want to visit with a good nutritionist that can help you plan menus etc that will make your life easier. I recommend Faye Elahi at www.specialneedsnutrition.com Sprouts and Whole foods will have many foods that you can eat and fresh fruits, veggies and high quality meats are almost always safe.