First of all I would like to know if you have been to a major cancer center to see if there is not a treatment for your Prostate cancer even though it has started to metastasize ( To the bone I presume but maybe not) You need to be checked out at a major center before giving up. A lot of Oncologists are stuck in the past for a variety of reasons. some become complacent Another reason may be the inability to obtain the latest and greatest equipment.
Please go to a MAJOR CANCER center such as Sloan Kettering in New YORK, Roswell Park in Buffalo, NY, Mayo clinic in Rochester, Mn there are others and there is one near you wherever you are.
FIGHT till the end do not give up