Bactrim and pain reliever

I was prescribed Bactrim for a bad sinus infection. I took it along with a pain reliever and decongestant for eight days before I had any severe side effects. First I noticed that my glands were swollen, and by that eighth day my left gland was the size of my thumb. I was getting extremely tired and kept spacing out, perhaps from being sick and taking the decongestant, and I had no appetite. At night my leg started uncontrollably kicking out for about half an hour as I was trying to sleep. I called for an appointment with my doctor, and on the way there I realized I was getting a rash on my stomach and chest and it was rapidly spreading. That night my face was scarlet colored and my whole body was covered in itchy hives. My doctor told me to immediately stop taking the Bactrim, but since so much was in my system, it took a few days for my body to return to somewhat normal.