Allergy Specialist for husband

I need allergy specialist recommendations for my husband. His hands and face started randomly swelling 2 ½ months ago and it has progressively gotten worse. He now will swell in his face and get hives all over his body. To our knowledge, nothing new has been introduced to the home or to his food. He does not take any medication regularly and has no known allergies. Just this morning he had to go to the hospital to get a shot on epinephrine to get the swelling down/hives to go away. . I don't care if we have travel out of state, I'm worried about how fast his allergic reactions have been progressing. Please give me recommendations on the best place to send him to.