Sulfamethoxazole Purple Blotch, Night Chills, High Fever, Arms and Legs, Muscle Pain

My boyfriend was prescribed sulfameth (10 days/ 2x) for these bumps that appeared on his arms and legs and would appear anywhere that he would scratch. Within 5 minutes of taking the first dosage in the evening, his eyesight became blurry. He had a severe headache that night, chills and a high fever that lasted through the night. He took 2 ibuprofen pills but they didn't help. He couldn't get to sleep the entire night. He also became even more itchy than before he took the sulfameth. He couldn't move due to muscle pain and fatigue. His fever was still there by the time i got there at 7 in the morning and he was shaking uncontrollably. His heart rate was up. It looked to me that more bumps appeared on his body and some became a dark purple blotch, like a bruise. His fever broke around noon and stayed away for a couple of hours but it returned. His skin started to peel after his fever returned. At first i noticed it was on his nose and ear but i didn't think much of it since i didn't see it anywhere else. An hour later he texted me and said his whole body started peeling as if he had sun burn. His temperature is still slightly raised after over 24 hours.
I refused to give him the second dosage of sulfameth that morning and proceeded to call the doctor who had prescribed it. All she said was that he needed to come back in. No way in hell was i bringing him back there. She didn't even look at him for literally a minute and prescribed this crap. She said nothing of the side effects. There was no warning. Even though i looked it up before he took it, I didn't think it would be this bad.