Dec. 30th I Had A Stent Put In For A

Dec. 30th I had a stent put in for a bent ureter and my kidney was shrinking...or this is how I understood what the dr said. I have a history of kidney stones. Yesterday the pain came back. Not the worst stone pain I've ever had but pretty painful. I've "drowned" myself for the last few days but the pain is in a constant spot and not moving. ER?