What Causes Blood In Stool With History Of Kidney Stones?

I am 49 year old male with a long history of kidney stones just had two within a week one 6mm and other 5mm had ct done it shows more in the kidneys it also shows i have a payalp on one kidney and deposits in my prostate, now two weeks later I have green diarrhea and blood in urine. I have dr app. in 3 days what should I ask them to check? its with a urologist