So, do antihistamines/allergy meds actually work for stress hives? I’ve been on Prednizone since Wednesday night, with the occasional dose of Benadryl whenever I find new hives. Now, I just found a new patch of hives on my arm. They haven’t really turned into red welts, just a few raised dots. I found another one on my chest earlier, waited an hour, saw that it was beginning to go away, and took a Benadryl anyway, to speed the process. At any rate, should I still be getting them?