Symptoms of bladder cancer in women

i have been to the doctors 4 times in as many weeks with blood in my urine. The doctor prescribed a course of antibiotics which didn't work so prescribed another which also didn't work. Results from the urine samples stated no infection in any of the samples so took the antibiotics unnecessarily. So the doc sent me to radiology to see whether I had kidney stones. The result were I didn't have kidney stones either. Week 4 all samples of urine have blood in them no infection and no kidney stones. Now bladder cancer has been mentioned and I'm back at hospital next week for further tests. Has anyone out there had similar or knows someone with similar results. Any feed back would be much appreciated. Thank you.