bladder infection
"Haven't had a UTI in probably more than 10 years.  Have recently been diagnosed with 2 in the last 3 months.  Had Macrobid both times.  The first time I ended up with fever and chills, but thought I was unlucky and had picked up a virus.  Symptoms went away by the end of the treatment.  When UTI came back, I was given the same medication.  Within 12 hours of taking the first does, my fever and chills became so bad that I almost went to urgent care.  Advil reduced the fever temporarily, but I won't take it again."