Yes it is possible to develop fungal infections after prolonged use of strong antibiotics. I would suggest doing a urinalysis
and a kidney bladder ultrasound
to look for abnormalities and possibly fungal balls.Kidney infection
can cause fever, chills and general body malaise or weakness and flank pain
and tenderness. Fungal infections can be treated medically with anti-fungal medicines.
I Hope I was able to answer your question.