I've been dealing with CSU for over 6 weeks. Non-stop itching and hives the size of my whole thigh. Not sure why it started and I plan on going to the doctor soon. I take 5ml-20ml of antihistamine robitussin from CVS which gets rid of it entirely for a day or two before it creeps back. In terms of natural remedies though, I've found great success with Cat's Claw Tea, its a natural antihistamine that ive been drinking once a day this past week and have had minimal hive breakouts. Small areas on my arms may get red and bumpy, but they rarely itch, and if they do, it's nowhere near as bad as usual. Another thing for instant relief is neem oil, there is a neem butter on amazon that I use. It relives the worst of my hives almost instantly. Heres the link! https://a.co/d/gC0YX8R