Right iliac fossa mild pain after food.

Since about 6 months I was getting hives almost every day all over my body. I was often taking anti histamines for this issue. I was also experiencing bowel changes such as constipation and loose stools during this time. About 1 month ago, I started feeling right iliac fossa mild pain, which would start 1 hr after meal and subside gradually. It is accompanied by brain fog, concentration difficulty and slight dizziness. The symptoms disappear when I am fasting. Subsequently, I also started getting joint pain and stiffness at night in knees, elbow and wrists. My doctor suggested that I may have developed food allergies. I realized that my hives started sometime after including Whey protein in my diet. Avoiding whey and dairy stopped the hives. However, other symptoms are still continuing after 3 weeks. CBC, LFT, RFT, Uric acid test results are normal. CRP qualitative - positive CRP quantitative- negative I have a history of asthama. Pls suggest how this issue can be treated.