Welcome to E health forum.
It seems that you are about to undergo a procedure called Extracorporeal Shock wave lithotripsy for renal stones within the kidney.
Extracorporeal shock wave lithotripsy (ESWL) uses shock waves to break a kidney stone into small pieces that can more easily travel through the urinary tract and pass from the body.
ESWL may be used on people with a kidney stone that is causing pain or blocking the urine flow. Stones that are between 4 mm (0.16 in.) and 2 cm (0.8 in.) in diameter are most likely to be treated with ESWL.
The stone is precisely located via X rays or ultrasound and then high-energy sound waves pass through your body without injuring it and break the stone into small pieces. These small pieces then move through the urinary tract and removed out of the body more easily than a single large stone. Sedatives and local anesthesia may be given to help you bear the pain if any.
This procedure negates the need for any major surgical procedure, which may be needed otherwise to remove the stone.
ESWL is usually an outpatient procedure. You go home after the treatment and do not have to spend a night in the hospital. After ESWL, stone fragments usually pass in the urine for a few days and cause mild pain. If you have a larger stone, you may need more ESWL appointments.
Hence you should consult with your doctor or a urologist, and undergo definitive treatment at the earliest. This will help you get back to your normal life much sooner than that if you delay the treatment.
I hope this helps.