On my six day of taking this medication I awoke in the middle of ...

On my six day of taking this medication I awoke in the middle of the night with a fever of 101 and was shaking almost uncontrollably due to chills. The next morning, the fever subsided but I began noticing red, rash-like dots all over my arms, legs, and torso. After doing some research on this medication and learning about some of the possible SERIOUS side effects I decided to go to the emergency room. The ER doctor told me I did not have "Stevens Johnson Syndrom" (my original fear) and prescribed me some Benadryl and Prednazone. A day later the rash has not improved and seems to be a little worse. It's "warm" almost feeling like a sunburn. I'm obsessed over this and am wondering if the doctor misdiagnosed me. Has anyone who developed a fever/rash from this drug and remember how long it lasted? Even tho the ER doctor released me, should I question this?