Hi, im sorry to hear about your troubles. I dont have kidney stones, but I had gallstones, and I cerntainly threw up. Sometimes when the body is in a lot pain, your stomache gets upset. Sorta like the reason you arent allow to eat while you are in labor, because your body is in pain, and it can make you throw up. I have never heard of it giving you a fever though. Hope I helped, let us know how things are going with you!
Thank you so much I hope they can find out something some.