dear user you have sharp pain around the left kidney but we should deal simply and with no stress and follow these simple steps and you will be ok you had bladder stone before and that means your kidney can have stones recurrent as the cabability for forming crystals increased and any one had renal stones befor should be monitored to prevent forming stones again....antispasmodic drugs can help you but should avoid any food rich in calcium oxalates or urates as tomatoes and beans and meat and mango ...also you should drink alot of fluids to flush your kidney continously you should do ultrasound scan every 6 month for assurance and if any renal pain begin you should do that before stones increased about uti you have suscebtibility of that and should begin steps of management...management of uti we should detect the causative agent for this .......the causative agent might be viral infection or bacterial ....simply you need to do urine analysis for investogation....if bacterial infection diagnosed treatment should begin with antibiotic as ciprofloxacin ....... you should know that it from sexual contact with infected person..you can follow these simple steps and you will be ok wish you healthy life