I have the same condition. My general doctor referred me to an allergist/immunologist, and I was told that I have autoimmune urticaria (hives). I was prescribed an antihistamine
75 (an antacid that also has "alpha blocker" properties), and Doxepin (an antidepressant that also has "alpha blocker" properties. Over time, I stopped taking the Zyrtec and zantac
. Now I am only taking the Doxepin. This seems to control everything pretty well.