I used to suffer urticaria ( hives) Two allergy specialists were unable to find the cause. I was taking 4 different drugs to ease the hives. ( I looked like elephant woman when the hives were on my face.) I was referred to a nutritionist who prescribed an elimination diet. I only ate natural food. Nothing processed. No numbers or colours. Organic meat and vegetables. It was a complete change for me. After a few months, my hives decreased and I gradually decreased all of the medication. I gradually started eating some processed food and haven’t had an outbreak of hives since I retired and became single 5 years ago. Touch wood. No stress helped cure me I think.