I have had black flecks, about the size of pepper or larger, in my urine for several months. The Dr. tested it and found no infections, no blood in urine, creatinine levels are fine. I have many other symptoms similar to those listed for carcinoid syndrome, like peripheral edema and neuropathy, abdominal cramping (esp. if I have even 1 drink of alchohol). Do you think the black flecks could be related?