I am having the same problem and no one seems to have a cure, just the cause! At this point I am ready to have my thyroid removed if that is what is causing this. I was diagnosed with Hashimoto's and my Dr. says that is why I am breaking out in hives. I am now taking 2 mulitvitamins a day and 1000 IU of Vitamin D along with 6 Zyrtec and 2 Zantac and I am still breaking out every day! I have only been taking the vitamins for a week, so I am seeing if that will work eventually, but this is so frustrating! Help!!!!!
One more thing... my Vit D and Vit B 12 levels are low. Please have your checked as well.