Old 1
First things first don't get too worried right now, your surgery was followed up in may with RT. The RT carries on working for quite some time after treatment finishes.
You still have a plethora of possible treatment options. A PSA of 7+ can be reduced or stabilised with The HT you are on now.
With no evidence of spread to lymph nodes or bones or soft tissue you may find that after 2 -3 years of HT your PSA is stable enough to go onto intermittent HT.
If your PSA continues to rise and gets to a level (often at 20+) your consultant may want to do further scans/tests to see if further more agressive treatment might be needed.
Sadly there is no general timescale for any of this but if you feel well then that is the best indication of all.
Make sure you ask loads of questions and make notes of options or longer term treatments when you see your medical team.
Best wishes
Xx
Mo