How much is your PSA level?
may be co-relating both gleason score and PSA level and also staging of tumor
to evaluate you for further line of treatment (hormones + radiotherapy)
As you say it is only locally spread so far, chemotherapy
may not yet be indicated ( unless spread to far places),radiation
might help a lot.
With modern treatment there are hopes for suppression and most important the will and courage, make all therapies have far more positive outcomes, so trust your treating doc.