Suggest Remedy For Rashes On Back And Chest Due To Penicillin

hi i saw a doctor today and was diagnosed with flaryngitis due to painful chest and throat when I swallow, lathargic (especially pain on the back on my knees), coughing up blood, severe sweating fits, sickness and hot and cold flushes. I have been given a course of penicillin but my housemates just pointed out ive come out in a rash on my back and shoulders and my chest and throat have become tighter as well as pain in my upper jaw (just below the ear)