Kidney stone. I am not over weight.

I am having kidney stone since last 10 years. Everytime when pain comes, i go to hospital, do all tests and get medicine. But again after some months, pain will come again. Last September 2019, I went hospital bcoz of pain and uncomfortable in urinary area. test results are Right Kidney: calculi of 3.4 mm and 3mm noted in mid. Left Kidney: bifid collecting system. Calculus of 3.5 mm noted in upper calyx Grade 1 prostatomegaly Volume 25cc. Renal function blood tests were normal. Blood Urea 19. Creatinine 1 and uric acid serum 5.9 Doctor prescribed medicine for 3 months (Potassium citrate and magnesium citrate solution) and i felt ok. after 1 year, pain comes again now. Please help me for permanent treatment. I've high cholesterol and Grade 1 fatty liver. I'm doing workout and diet control for that. I am not over weight.