I am allergic to Penicillin. I was prescribed Cefdinir. I took it for 5 days with Prednisone. I stopped all medicine because I was going in for allergy testing. After the allergy testing I resumed the Cefdinir. Five days later I started to get a horribly itchy rash(arms, stomach, back, legs). Barely sleeping. I stopped taking it on the 6 day, which was a Saturday. It is now Thursday and I have had no relief. What should I do? Benedryl barely helping.. do not want to get on another Steroid.