How can you reduce the itching and swelling from Urticaria (Hives)?

Well, I was eating pizza one night, and it had toppings I tried before. Then after ten minutes, I started to get hives all over my arms. I'm guessing it was the oil or the way they made the pizza that triggered my allergic reaction. I paid a visit to the doctor to see what he had to say (my eye and cheek started to swell up). He put me on a prescription, but as expected, my hives disapeered (then reappeared) over and over again. The itching and the swelling isn't fun either. Any help on how I could reduce my discomfort without any medication? (P.s. already tried benedryl). Thanks!