Thanks for your query.Based on the facts that you have posted it appears that you have a single kidney from birth and have repeated episodes of UTI.
has diagnosed it to be due to Interstitial Cystitis
.The diagnosis of Interstitial cystitis can be confirmed only on biopsy of the urinary bladder
and can not be diagnosed only on clinical or routine urine tests.Niftran
is a Urinary antiseptic and does not can not damage kidney.
IC can not be cured permanently ,one usually gets relapses and recurrence of symptoms.
Your problem is a Urological problem and not Gynaecological one.
ICill not affect pregnancy
if treated symptomatically during pregnancy.