Copious blood in urine, ct clear, not much pain but very tired and nauseous.no temp. doc ruled out kidney, what else could it be?

Lots of other things: When you have blood in teh urine it could be the kidneys or the 'piping ' which is the ureters/bladder/uretra and . In general the kidneys are last place to look for the couse . For females contamination of urine from vagina is other possibility.

Cysto?: You need a cystoscopy to evaluate your bladder lining. It is never normal to have copious blood in the urine.