Hello Thanks for query . ou are known to have recurrence of kidney stones since many years and now getting severe pain in renal area with hematuria . These symptoms are mostly due to stone either in kidney or impacted stone in ureter causing back pressure changes in kidney (Hydronephrosis). You need to 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 Further treatment will depend upon result of these tests and final diagnosis.more precisely on site and size of the stone and degree of hydronephrosis on affected side . As regards your quer about measures to prevent formation of Oxalate stone You need to take adequate calcium along with Oxalates in your diet 2) Avoid excessive salt intake 3) Avoid stuffs rich in Oxalates and Phytate like spinach ,Tomato ,milk products etc 3) Drink more water 200 ml every hour Avoiding getting UTI is most important to prevent stone formation . Dr.Patil.