4 1/2 year old son with eczema and severe itching at night.

Hi to all,
We live in Chicago. My son started having eczema from 1 year old. He has very dry skin , has some patches on his body. The patches looks pretty clean, may be a little bit pinkish. HE is itching when he goes to the bed. At night between 12 am. to 2-30 am he has severe itcheness allover his body, very intensive itching. His skin looks like fine poweder. Overall he is in good health, very rarely gets cold or any type of infection. He is allergic to peanuts, hazelnuts, wheat, and eggs. We elaminate all of these from his diet. He is also allergic to mold,and dust. He drinks rice milk, soy milk (our preference), very much likes apples, he eats any fruits,he does not like vegetables, (I am thinking to give him veg. supplements), he drinks water with small sips at a time. He likes sweets,ice-cream ,like many other kids,and right now it is totally eliminated from his diet.
He is very happy kid, anxius about others,very talkative, impresses people, likes to dress nicely, very cognizant about his appearance, impatient, likes to eat outside, likes to go outside, he likes his home too. He was afraid of darkness and sleeping alone, but when we moved his 14 months old brother to his room ,he seems to be doing fine.
We tried Sulpur 30C, but it did not help. Any suggestions about his treatment will be kindly appreciated.