What could it be cysts, cancer or who knows?

Ok so a few months ago I had some bad kidney pain and then it lightend up to be barable then about a month ago I started haveing bladder and kidney pain and ping small white things in my urine belive me it was in my urine as well had signs of blood in the urine my doctor thought it was a bladder and kidney infection, he did a UA on me and it came back clean I also need to add that a few years ago I had blood in the urine and that doctor wrote it off as an infection after a negitive sign of bacteria, any ways but my DR also checked for STDS and that came back fine as well. I took the medicane and I am still having pain and some of the stuff I was ping, I have called my DR and have been refered to a urologist. I guess I am needing a take on this from some other people. I will also add that in the last 2 yrs I went from 132 down to 97 most of it was lost with in a 6 month time I went from 132 to 100 and have been loseing more and more, I also have joint and muscle pain, fatiuge, migranes, just to name my more ongoing problems the last thing that might help to understand is that I am a 27 yr old female and I had a hysterectomy when I was 24 almost 3 yrs ago had to have that because I had everything but cancer and it was a total hysterectomy. I thank anyone for your answers and opions.