Kidney stones?

I’m not sure what’s going on, I’m consistently peeing small jelly like clots of blood. At first my pee was beet red now it’s just clots. I’ve been to the urgent care and the ER and both just say it’s kidney stones and send me on my way. I historically have weak kidneys and am prone to UTIs. I have some flank pain but it comes and goes and isn’t nearly as painful as some UTIs I’ve had. I just have burning after finishing urinating that lingers for minutes after and clots of blood in my pee. Kidney stones or infection? The ER didn’t want to give me a CT scan because I had one about 6 months ago and they’re worried about over exposure to radiation so I’m kinda just in the dark .