How Can Vaginal Bleeding, Back Pain And Kidney Stones Be Treated?

My mom is having vaginal bleeding (54 past menopause) and Back pain that kind-of also hurts in the area where kidney stones would hurt her too.. We aren't sure whether its vaginal bleeding or just blood in the urin but I am pretty sure that it is vaginal bleeding because of the amount of blood she seemed to act like it was more then would be if it was just blood in the urin. We called her doctor and he didnt seem worried but hes the reason my dad is dead so i don't trust him. This could be a few different kinds of cancers and a couple other diseases and I am scared because I can't lose my mom too I just turned 18 in august. What should I do