Doctor told me that "there is a small amount of blood in urine but not enough to be concerned of" should i be worried because i don't trust him?

Blood in urine?: You seem to have two problems. The first is your "blood in urine" (b). If you do not have a urinary tract infection and you had b, have the urine analysis repeated. If it is negative, recheck in 2-3 months. If it is positive for b, go to a urologist for a work up for your b. The second problem is just as serious. If you truly cannot trust your physician, you need to find another one. Good luck.