I would advise you to do
CBC
Creatinine
RBS
Urine culture
USG KUB WITH PVR
Next Steps
plenty of fluids
t.levoflox 500 mg daily morning X 7 days
c.Duoflow twice X 5 days
syp Potrate 2 TSP TDS with glass of water X 7 days
Health Tips
my differential diagnosis is
UTI
left lower ureteric calculi
follow up with investigation