Wow! your problems are much more severe than mine. I have been treated for SIBI, Candida and excess histamine growth although none of the providers I have seen - mostly functional medicine types- have come up with a clear Dx. My itching is generally confined to my scalp and forehead. I had to give up booze because it made me itch really bad. Two weeks ago the APRN was seeing told me that she had no idea where my itching came from. I only know that my diet of oatmeal and blueberries for breakfast, eggs, egg whites and toast for lunch, a protean shake mid afternoon and some kind of chicken and veggies for dinner helps me from going nuts.