Need advice on feeding my son

My ds is allergic to Peanuts, tree nuts, dairy and eggs, wheat is questionable. Her reactions have always been eczema and hives. I also have a 9 month old son. He started with eczema early on but it improved greatly when I stopped eating eggs. I breast fed exclusively until he was 6 months old and am continuing in addition to the solids I am trying to introduce. I have tried Rice and Barley cereals and sweet potatoes, they have all caused gas which had him up every hour all night. He was very difficult to console. He doesn't seem bothered by oatmeal but his eczema seems to be getting a bit worse. The only foods he has tolerated with no problems are prunes and green beans. I am concerned about his nutrition. I really wanted to get him on a fortified cereal. The pediatrician is also recommending vitamins. The only vitamins I can find are Poly and TriVisol. They are flavored with orange and lemon oils. The allergist had told me to avoid citrus until he was 3 years old. I'm planning to call the allergist and pediatrician tomorrow. Does anyone have any words of wisdom?