I have had hives for a day & a half. I would like to know if this could be related to nerves. I don't have any food allergies. I went to the doctor yesterday, she gave me a shot of Epinephrine. That helped for a couple of hours. I have been taking benadryl every 6 hours & putting blue star ointment on. Before I got the shot my mouth was swelling and I almost lost my voice. Please, let me know what to do.