Talk to Urologist on About Kidney

I have very swear pain in kidneys and abdomen also at the backside in pregnancy time, and I feel my chest has weight on it. And every night, I had a fever, then vomited around 3 nights sometimes in the afternoon time so I feel very uncomfortable due to these situations, I am drinking a lot of water, and my pain is still almost all day and night. For me, it's very difficult to tolerate, suggest some good decisions to recover this problem. How is kidney stone made??