It would be useful to know your original diagnosis, what areas the external beam (I presume?) radiotherapy targeted, and subsequent PSA history.
You really need to know where the cancer growth is, which requires a scan of some type, and that depends what your PSA is. (Scans need a reasonable PSA to stand a chance of seeing anything.)
It's unusual to have surgery after radiotherapy. There are two reasons for this:
- The cancer spread is less likely to be in the parts treated with radiotherapy.
- The prostate will not be in a good state for surgery after radiotherapy - it very likely has adhesions joining it to neighbouring tissues, and most urologists would not contemplate surgery at this point.