Hello Thanks for query . You have lost one kidney due to stone disease and now has stone in existing kidney with infection . In view of you having only one kidney it is vital important to get investigated and take necessary treatment to remove the stones by appropriate modality at earliest . Please consult qualified Urologist for clinical examination and get following basic tests done to confirm the diagnosis. 1) Urine routine and culture. 2) Ultrasound scanning of abdomen and pelvis 3) Renal function tests 4) Intravenous Pyelography (If Creatinine levels are normal ) Further treatment will depend upon result of these tests as regards sizeand site of the stones and final diagnosis. Dr.Patil.