Red and white blood cells in urine. docs not worried - decided it was endometriosis (without further tests). should i seek 2nd opinion?

DEFINITELY!: Red and white blood cells in urine could mean possible bladder infection; urine culture can confirm this. Endometriosis can only be diagnosed by a biopsy or direct visualization (can't biopsy something that you can't see so visualization is required) via laparoscopy. Start with a urine culture; if negative and there is suspicion for endometriosis, see a gynecologist. Best of luck.