The most important thing to bear in mind is that YOU ARE GOING TO BE CURED. Localised prostate cancer has excellent treatment success rates. You're NOT going to die from it, so put that thought right out of your mind. You get treated and you get on with your life. Treatment isn't particularly enjoyable, but it's not too awful either. Try not to get too stressed about it - you're definitely in the right place. Most of us here have been through it.
All the best,
Chris