Hey Jen...just wanted to let you know I am hoping you find an answer. i seem to get every skin thing except the pyoderma gangrosum. I have never had my lips with hives, but I did have my whole body swell (and I mean the whole body).
Doc at the time recommended both Claritin and Pepcid or Prevacid????(ask your pharmacist for two OTC antihistamines that represent antihistamine A in one and B in another). It did bring down the inflammation well. I just get too dried out from them. make sure you drink a lot of fluids when taking the antihistamines
Take care of yourself