Hi Champion65.
Like Chris J I have incurable PC, and I am on Zoladex for life. I am also on Apalutamide which has similar side effects. Hot flushes are an ongoing problem. The current heatwaves are compounding the problem.
I was offered acupuncture to help, but fourteen hours of this treatment did not help. It does for some people.
I was then offered Medroxyprogesterone. It took a couple of months to kick in, but it has helped a lot. My hot flushes are much less frequent. I don't know if it is appropriate now that you are off Zoladex, but it might be worth sounding out your oncologist on both these treatments.
Best wishes and I hope you get some relief soon.