Symptoms of the flue symptoms and conditions

My husband was recently prescribed Bactrim from his family doctor for a case of the ful. We thought it strange, since flu is normally not treated with antibiotics, viral we thought. Anyway, we felt Doc knew best, so he took three doses. His original symptoms of the flue were simply nausea, vomiting and a bit of diarrhea. After taking the bactrim, he developed a very high fever, headache, pain in legs and feet, burning eyes, chills so severe his whole body shook with a vengeance. He was sent home from the ER and told this was "worsening flu symptoms" and to continue the medication. We didn't follow the advise, and thought it might be the bactrim. He still continued to get worse, and went back to ER next night, bad stomach pain and all other symptoms worse. We found out it was all due to the bactrim, which shouldn't have been given in the first place for a mild case of the flu. He also suffered decreased kidney function, which has taken some time to come back to normal (luckily). His heart rate is still increased after several days, and may remain so permanently, requiring him to take beta blockers for the rest of his life. The doctors won't admit this is from the bactrim, but i have found medical literature stating otherwise. His doctor said it was his fault for not reading or understanding the little insert that came with his medication from the pharmacy. A lot of this information wasn't even on it. There are so many other choices of antibiotics to use, which do not chance a horrible reaction, permanent medical problem, or a fatality, which seems to be the case more often than it should from the medication, bactrim.