Hi, many thanks for the query!
Stone in kidney
has passed in to ureter
causing excruciating pain, you need to do some investigations- USG (KUB), Urine (routine & microscopy), Sr. creatinine
, Sr. uric acid, CBC, X-ray KUB.
According to reports of the above mentioned tests, you may need to do further investigation i.e. IVP (intravenous pyelography/urography) to decide the treatment modality. Till then take symptomatic treatment as per your doctor's opinion including antibiotics, pain killers, anti-spasmodics, diuretics, antacids.
Wish you a good health. Take care.