Allergy Reaction?

Rey was on Elecare, a corn-based elemental formula that is used normally with feeding tubes; and I stopped giving him the formula for two reasons: a) his latest blood test showed that he was allergic to corn; b)corn syrup solids. Need to say more? I started giving him rice milk, but he wouldn't drink it. He loves soy milk, but in the latest blood test, it showed he was allergic to soy also! I was trying to find an alternative; and days passed, and I had no choice but to give him soy milk. He started having eczema again, and I was suspecting the soy. I tried again rice milk, with Living Fuel berry powder, and he was happy. But I noticed that his stools were too loose; which is not normal for him. I took away the Living Fuel powder, but he wouldn't drink the rice milk. So I had to go back to soy milk. His loose stools continued; that means that it was not the Living Fuel powder. It was the soy! The eczema, the rashes, the loose stool... he hadn't reacted like that before to soy. A year ago, a skin test showed that his allergy to soy was 0! Rey has an endoscopy soon, so I am more than curious to see how he is doing, and what has the soy have done to him.