A few months ago I was diagnosed with a UTI and was prescribed Su...

A few months ago I was diagnosed with a UTI and was prescribed Sulfamethoxazole (1 pill twice a day for 10 days). After a few days, my UTI was cured, but I continued to use the medication as I was instructed by my doctor and pharmacist. I had no side effects or allergic reaction for the entire period. However, on day 11 I noticed a small splotchy red rash on the right side of my body near my armpit. The next day the rash had spread to my legs, stomach and other side of my body. It was not raised and did not itch, so it didn't worry me. My boyfriends suggested that it might be a reaction to the medication, but the rash did not appear until at least 24 hours after taking my last pill. Five days ago, I became worried that I had contracted another UTI, so yesterday I visited the doctor again (a different one). She asked if I was allergic to any medications and I told her that I wasn't aware if I was. I did not think about the rash from a few months ago because I did not believe it was related to sulfamethoxazole. So she wrote me another prescription for the medication, but this time I was instructed to take 1 pill twice a day for 3 days. I took one pill around 4 PM yesterday and within 30 mins my entire body began to tingle and itch slightly. 2.5 hours later my face was bright red and severely hot and puffy. My eyes were as red and puffy as my face. Around 9 PM I began to chill and shake severely and I took Excedrin for a mild, dull headache. I took a warm shower, but I felt extremely fatigued and became nauseated simply from standing. So I got out with intentions of vomiting, but when I sat down in my bathroom floor I no longer felt nauseated. But my shaking became even more severe. I was cold, but also I was nervous and anxious because I felt mentally unstable. I have never battled depression, but I felt a slight bit of depression last night. I was very irritable and short tempered, which is very unlike me. My skin became so sensitive that I could not even stand feeling my boyfriend's breath on my shoulder. My body began to ache, specifically my ankle and knee joints, and it hurt to walk. I woke up around 2:30 AM with a fever of 100.4, so I took two Tylenol and the fever broke quickly, but I did not feel much better. This morning I feel a little better with no fever, but I still have slight chills and my whole body is red and itchy. Yesterday evening was a nightmare.