Sulfamethoxazole and gallbladder

After reviewing my record of previous reactions to antibiotics (because so many of them make me nauseous), I was prescribed this med for 20 days for an upper respiratory infection. I took for 5 days without any problems, I woke up on the 6th day with severe adnominal pain and nausea. Because my doctor was on vacation went to a different doctor in his office. Reminded him about the med I was on, but hadn't bothered me yet. He determined it was gastroentreritis probably caused by previous nights dinner, so he prescribed Nexium. But also had me do an upper sonogram to check for gallstones because by gallbladder seemed tender. The sonogram showed nothing wrong. I didn't take any medication that day. I took the Nexium and the sulfameth the next day (Saturday). I had flu like symptoms all day, aches and pains all over, face swollen, headache. I awoke Sunday with a rash all over my body, just itched in a few places, no apetite but thought I was feeling better. Thats when I started reading this site about all the side effects and deteremined the Sulfameth was the problem. Could not sleep at all Sunday night, my legs hurt so badly. I had other pains in back, arms, hands but my legs were the worst. I finally went to the emergency room at 4:30 in the morning because I couldn't take the pain. They ran blood test to determine nothing wrong. I don't think anyone believed it was a reaction to Sulfameth because I had taken for 5 days without problems. Prescribed Atarax and Prednisone for the rash (which was going away). Was reluctant to take any medication, but my doctors office confirmed this would also help the joint pain. I took and could feel a little difference, at least was able to sleep some. But still severe pain in my legs, took another dose of Atarax and actually woke up with most of the pain gone. I also had the vivid dreams. This was the sickest I have ever been, the pain was relentless.