Confused, Anxious and very Scared

Please can someone put my mind at rest.  I have been having left side flank pain and then the GP found microscopic blood in my urine.  I have had the following tests:

7 March 2018 - Ultrasound of womb and ovaries - all ok

Blood tests - normal

24 March 2018 I went to A&E as was in a lot of pain.  They performed the following tests:

Blood tests - normal

CT scan of kidney and bladder - normal

The hospital assured me that I did not have cancer.  However after a follow up appointment with my GP she has booked me to have a cystoscopy on 5 April 2018.  She also said she is 90% sure that I don't have cancer.

This has got me not sleeping or eating as hospital said I didn't have cancer but GP only 90% sure.

Im going out my mind!!!

Have you had an X-ray of your spine?  Just wondering if you have a disk or something impinging on a nerve