Hi Trev,
Welcome to this forum but sorry it is because of a PCa diagnosis that you join us.
To answer what appears is a contradiction on PSA numbers. There are quite a number of types of PCa some of which show a low PSA but nevertheless the cancer has advanced whereas at the other extreme some types of PCa produce moderately high PSA figures where the cancer is still contained. PSA can also be raised for other reasons, so moderately raised PSA does not necessarily mean a man even has PCa but can, often considered along with other indications lead to tests scans that show cancer.
What I suggest you do is find out through your GP or hospital consultant, if you are unaware, the other details of your diagnosis, ie, Gleason score, staging and scan information and any additional information such as percentage of cancer found in cores and how many affected. If you post this under your bio we will have a better idea of your situation.
Meanwhile, I think you would find it very useful to obtain a copy of the 'Toolkit' from the publications department of this Charity. It will help you gain a better understanding of PCa and detail the main treatments, some or all of which may be open to you.