Hi, dear I have gone through your question. I can understand your concern. You have kidney infection and pain. You are taking analgesic which can leads to gastritis and maybleads to bleeding. You should check for stool occult blood test. You should take proton pump inhibitors like rabeprazole or esmoprazol. You should also check for urine culture and sensitivity test. It will give exact idea about antibiotics effectiveness. Then you should take treatment accordingly. Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using health care magic. Wish you a very good health.