Hello Welcome to HCM.. I am really sorry to hear this about your health but I m definitely going to help you out.. I thank you for posting your query here.. I being a surgeon, we encounter so many such cases day in and day out.. I read your question completely and have understood it well enough. I will analyze all your points and provide necessary explanation and how to go about from now on.. But, need few other details for better understanding of your case A. Your gender B. Age. C. Kidney stone size and location if any Anyway, please note these following things.. 1. Severe back pain that you tell, yes seen in renal calculus or stone. I m sorry that your doctor couldn t get the diagnosis.. 2. Kidney infection and kidney Stone. Well, I would like to tell you that kidney infections are common complications of kidney stones.. And, the cause that is stones have to tackled with priority to avoid further infections. 3. Low potassium may be the cause for renal stones in few patients.. 4. Please do these following things . A. For kidney infection, Get urine routine and urine culture tests. This will tell us the infection extent, organism responsible for infection and antibiotic to be given. This has to be treated first.. Later, for kidney stone B. Various treatment options are available.. And it depends on size and location of stone. Most stones less than 2 cm can be managed with shock wave lithotripsy, a non surgical means. So, let me know the details.. Hope this helps you, in case you need any further assistance, please let me know. Take care and God bless.