Suggest Remedy For Itchy Burning Rash All Over Body After Taking Amoxicillen

Hi,I am heading into 4th week of a severe rash, which began about a week after taking 10 day course of amoxicillen for a Strep. throat. A clinic Dr. prescribed Antihistamines and some Hydrocortisone creams, and to drink lots of water. I have done all of this, and it is still very severe, itchy and burning all over legs,feet, arms, trunk. Ankles swelling up at times. skin very hot and tight on lower calves. I need help, this thing is not going away, as the Dr. said it would?H