Blood in the urine and pain in the area of the kidnys are both symptoms of a urinary tract infection. I would DEFINITELY talk to a professional because if that's what you have, it's easy to treat but it won't go away by itself. And probably not related to the fast or SWF (Salt-Water-Flush) because they are caused by bacteria. I go through phases where I get recurrent UTI's, sometimes for no apparent reason. Cranberry juice helps with symptoms.