My Dr. put me on Bactrim for a UTI infection. The first couple of...

My Dr. put me on Bactrim for a UTI infection. The first couple of days it seemed to work really well taking care of my UTI, and I did was i was told take all the meds which was 2 pills for 5 days. Well, I was suppose to start my cycle about the same time I started taking the Bactrim, 11 days later Iam still waiting to start . I feel awful. My stomach is swollen,my back, ribs, upper and lower abdomin. I have weak feeling muscles and chills at times. I called my Doctor and all he said was yeah, that can be a side effect sometimes. Well , i sure wish he would have informed me, I would have never taken it. I sure never will again. All he said was he was sorry for my discomfort didnt ask me to come in for a exam or anything. I guess i just have to let it get out of my system. I dont have heath insurance and it was expensive enough going in for the initial problem.