I Started Prednisone And Took 4 10 Mg Each Day

I started prednisone and took 4 10 mg each day for 2 days..then I met with my primary dr. And she told me to stop it that the side effects were bad..now I have a rash on my arms and legs..is this a side effect? ..I was given 50 mg Benadryl to help me at night..my dr. Has not returned my calls and it has been 5 days..