Why do I have a lot of blood in my urine and no kidney stones or infections?

Hematuria. That doesn't go away and it is not due to obvious reasons like infection or passing a kidney stone needs further investigation - ct scan/ cystoscopy. You need to see a urologist and be aware not all dark colored urine means blood in the urine.
Blood in urine. This requires evaluation - blood in urine may indicate a bladder problem or a kidney cyst or a glomerulohephritis or interstitial nephritis problem. Urine analysis for protein and urine exam with microscope is essential; then ultrasound if not done already is essential - unless the CT scan you mention was of kidneys. This is not normal and indicates disease of your urinary system somewhere.

Related Questions

Went to ER for severe lower right ab pain and back pain. Dr said I had kidney stone and hematuria. Did urine and blood tests only but no cat scan, why?

See answer. Though symptoms and u/a may be suggestive, one cannot reliably make the diagnosis of a kidney stone without some type of an imaging study (kub, ultrasound, ct) with a non-contrast ct scan being the most accurate and reliable imaging study to determine the presence, location, and size approximation of a stone as well as to potentially rule out other causes of pain and hematuria. Read more...