Allergic to Breastmilk?

Can you believe your baby is allergic to your breast milk? I thought this was nonsense. Isn't breast milk is the easiest digest and the safest milk for babies?

After six weeks of breast feeding, I found traces of blood in my girl's stool. The doctor decided that she was allergic to my breast milk due to the milk products that I intake. So I stopped eating, yogurt, cheese, milk, and ice-cream. But about twice a week, her stool still had blood in it. Maybe because of the food that I ate had milk ingredients (ex: cake, cracker..etc). It was very difficult for me to eliminate every little dairy products in the diet. Thus, I put her on formula (Similac Alimentum). My girl won't take powered Alimentum. She only takes ready to feed. It is so expensive. But I haven't seen any blood in her stool after about 2 weeks she had Alimentum. Below website also talks about breast milk allergy that maybe helpful:

http://parenting.ivillage.com/newborn/nbreastfeed/0,,70jn,00.html

http://www.kellymom.com/babyconcerns/bloodystool.html