Impacted stone in ureter may or may not be causing symptoms. Small stone in ureter  of 6 mm has about 50 percent chance of spontaneous passage in the urine however follow up is advisable as potentially may cause harmful effects in kidney Mixture of potassium magnesium citrate mixed with glass of water thrice daily helps in reducing symptoms and spontaneous passage. Consult a urologist for clinical evaluation and prescription as per your body weight and clinical condition