I recently had a breast reduction performed and developed a minor...

I recently had a breast reduction performed and developed a minor, natural infection due to the type of surgery, yet needed an antibiotic to help clear it up. My surgeon prescribed bactrim, and I was fine for the majority of the taking. About 2 doses away from finishing the meds, I noticed a rash on my stomach when I got out of the shower. The next day, I was covered completely head to toe in a giant rash that felt like severe sunburn, with 102 fever to accompany it. I have never felt so bad in my entire life, and on top of everything else, I'm graduating from college in 2 weeks and had 2 finals to take within those 2 days. It felt like someone let me soak in boiling water for an hour--severe sunburn minus the sticking--and I was FREEZING. Well anyway, I'm just getting over the itching now, it's been a few days. And now that I think back, I did have a headache for 3 days straight prior to the hive outbreak (but I just thought it was my allergies). My PCP told me I was allergic to sulfa drugs--NO MORE OF THEM!! But no resentment to my surgeon (he's amazing), because we had no idea that I was allergic to it in the first place