Sulfatrim Pediatric and sulfatrim

My daughter has been on Sulfatrim for about 2 years, she was diagnosed with bilateral urinary reflex or (VUR) grades 4 and 5. I'm concerned for my daughter's health. I noticed that my daughter (about 4 months old at the time) had started having what looked like seizures, after being on the drug. She would and still does lay on the floor and draw her left leg up in to her side, while her right leg is straight out and stiff. She puts her head down and sometimes she headbutts the floor. She sweats when she does this. She alert though. We went to doctor and she had a test done to rule out seizures. We keep going back and they can't seem to find out what is wrong. This is not a normal thing or "tick" that my daughter does. I would like anyone else with these systems to come forward and talk with me please. V