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Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
High grade temperature, lack of response to trimethoprim and other symptoms suggest the likelihood of kidney infection.That can cause soreness of back as well.Nitrofurantoin is not a good antibiotic for kidney infection, but this may have worked in your case to some extent.Your current symptoms can be due to the nitrofurantoin related side effect.If fever returns, then it will suggest an incompletely treated kidney infection.Ciprofloxacin is a better antibiotic for kidney infection for future reference.You can try over the counter anti inflammatory medication like acetaminophen or ibuprofen for any improvement in soreness.If no improvement or return of fever ( temp >101F), then you should see your doctor again and request for a kidney ultrasound as well.
Kidney infection almost always causes fever along with flank pain.Urine analysis may not be diagnostic always for kidney infection.Kidney scan is better for diagnosis.Best wishes
This is normal temp.Very welcome