That sounds awful sweetie! Maybe you should call your doctor today and see what he says. When my skin burns its not as bad as you describe...((Hugs)). I usually get a cool wash cloth and lay on the area that burns and stings or run cool water over it. I have sat in a tub of cool water before as well.
I hope you get some relief soon. Please keep us updated and take care. You are in my thoughts and prayers.