To all, well, thanks for your replies. This really is a great forum, even if does seem to lean toward the younger crowd.
I never even heard of proton therapy, and it was never offered. I have heard of HIFU, high intensity focused untrasound, but I'm not even sure if that's offered in the US. Might have to go to Canada or Europe.
Had my 18th radiation treatment today, 7 more to go and I'll be finished. Saw the urologist yesterday. Urine is normal, left about 50cc behind, anything under 100cc is good, at my age. He put me on Enablex to control urges to urinate. So far, no other problems, no leaking at all, no e.d. - (and if you young'uns don't think you'll be worrying about e.d. when you hit 72, allow me to enlighten you: you will not want any e.d. problems at any age, maybe when you're about 97.)
Thanks again to all. I wish you all success. Sluggo72