I have had multiple kidney stones in my early 20s up unroll around 29-30. I'm 35 now. I had many lithotripsys along w/ a percutaneous removal through my kidney. Few days ago I realized my left kidney was hurting, few mins passed then realized it was most likely a stone due to groin hurting and back. Moved around pacing back n forth went per a lil to realize pretty bright blood in pee. Soon after pain was gone and I felt fine. Total of 20 mins. Figured I got lucky and passed it. Few days pass still no pain however I'm still passing blood in pee. My urine color goes from almost dark looking blood to redish blood then nothing, clear as can be. Question is my back had hurt 1 day, 5 days ago. However I'm still passing more blood in urine than I ever have. only symptoms I have currently as well as past week are Headaces, bloated along w/ unusual amounts of gas/air. Could it be a stone stuck and that's where the blood is coming from.? W/o any pain? I have had probably 15 stones from 2001 -2007/2008 most were removed surgically...I have passed few on my own. Or is it something else?