SMZ-TMP DS and arms and legs

my 95 yr. old mother was given 2 SMZ/TMP pills 12 hrs apart and within hours after the 2nd one, spiked a fever and became flush around her eyes and then her entire face. She ended up in the emergency room. Several days later she broke out with hives, red blotches, arm bruises, a skin infection, and blood vessel breaks on her arms and legs. She also itched terrible all over. Doctors thought it was her blood platelets causing this but they were wrong. She is allergic to sulfur drugs. Finally after 5 weeks now she seems to be improving. This is a very dangerous drug for some.

I was prescribed SMZ/TMP DS 800-160 for a UTI...one pill twice a day. I had been taking it for 2 days. On the 3rd day, I broke out in hives in areas on my chest, sides, back and stomach and the next day started noticing small bumps on my arms and legs, too, that weren't as small and irritating as the hives the day before. Needless to say, I stopped taking it that day, the 4th day. However, it's the 3rd day since I've stopped taking it and I am still itching and skin is still broken out. This medicine had also caused a loss of appetite and altered my taste buds, but the break out is the worst of all and is ongoing, unlike the other side effects which were back to normal shortly after I stopped taking the pills. If anyone else has experienced the skin irritations, how long did it take for it to stop after taking the pills?