Suggest Treatment For Chronic Hives Despite Taking Benadryl

I have suffered with chronic hives very day for the past 17 years. I have been to 11 doctors total. To environmentalist, dermatologist, family physician, Internal medicine, podiatrist etc. No one can help me. They all have me take Benadryl, Zyrtec or one of the other over the counter medicines for allergies. None of them work. I have been out thousands of dollars and can not get a diagnosis for what is wrong with me. I have had allergy test and blood test with no results. I am allergic to a few medications, penicillin, sulfa drugs etc. Also, a few types of food that I avoid. I get red, itchy welts (that are hard) and are different sizes all over my body. They not only itch but hurt and burn. I am now in my mid 50 s and my skin is now drying out. No type of moisturizer or lotion is helping. My skin is actually tearing and bleeding. Does anyone have any idea what or how I can get more moisture in my skin is there anything oral that I can take? The dryness is just making my hives worse.