I am very curious why your physician recommended radiation as the first step in treatment? Per my physician who was adamant about this, he said: "you never want to do radiation 'first' because it basically turns your prostate into a walnut sized chunk of concrete, making it impossible to perform a successful radical prostatectomy (RP) thereafter." He said, "you should always do the RP 'first', and if/when you need it, follow-up with radiation."
I know this for a fact as well: the father of the girl who cuts my hair is in a living hell for the rest of his life. He did radiation because he feared surgery. He screams and groans/moans from pain every time he "tries" to urinate. When she visits her parents home, she sits and watches her concerned mother cry as her father's screams are coming through the bathroom wall as he spends 20 minutes trying to urinate. He comes out of the bathroom looking haggard from his futile efforts. And of course, his urologist said that he is no longer a candidate for RP due to the complete course of radiation he went through. My recommendation: Before you get further down the line with radiation, you may want to re-visit the "radiation vs RP" topic (pros and cons of both) before it is potentially too late for the RP. Good luck...I wish you well.