Sulfameth trimeth symptoms and conditions

Was prescribed DS (Double strength) 800-160 Sulfameth/Trimeth for 7 days/ 2 pills per day to treat a staph infection from a cut. On the last day, I woke up with a swollen gland under my left ear and a red, itchy rash all over my face and arms. Small hives also began to appear. Today is the next day and the hives are spreading but don't last very long. Very itchy, though, and that's unrelenting. Hoping it will decrease quickly since the first symptoms didn't appear till the dose of Bactrim was almost over.

I was prescribed Sulfameth/Trimeth DS 800/160. I have to take the pill 2 times a day for 3 days for a UTI. After taking my first pill the burning went away, but I woke up in the middle of the night with horrible abdominal cramps, worse than the ones I would get with menstruation. I also had headaches, neck aches, diarrhea, nausea and a wicked loss of appetite. I can't believe after all of these negative side effects the drug is still prescribed! I would rather have the UTI than have to deal with Sulfa ever again