I brought my boyfriend into the ER today after an allergic reaction to a ground wasp sting. They gave him 50mg of Benadryl and 125mg of solu-medrol which completely eradicated the hives and flushing. It has been 11 hrs and the hives have returned. He has hives on feet, legs, groin, torso, chest, palms, arms and armpits. There is even a few on his face, lower lip and near the eyes. He is also experiencing stomach pain. There is no sign of tongue or throat swelling and his breathing is fine. I gave him 50mg of Benadryl 2 hours ago and another 50mg 1 hour ago. The Benadryl is not helping at all. Should I bring him back into the ER to get the hives under control or should we try to toughen it out at home?