When I urinated I passed blood. Some time before, I had what I call, a spasm in my back that moved to my side. I did consult (by phone) an emergency room hospital , and was told to drink a lot of water, if it was pinkish color incouldvwait and see my family Doctor tomorrow, but if it stayed the same to go to the emergency room. What are your thoughts, and what could be wrong with me? Thank you in advance.