It is my understanding that surgery and Brachytherapy success rates are very close and surgery is not for everyone. Please gather all the information you can and make an informed decision. There are follow up procedures for those who have had radiation and new treatments are emerging very quickly. I understand that HIFU can be performed post-radiation.
If you are not a surgery candidate please do not feel that "all is lost" - there are other treatments available which is why you have to reseach everything before making your decision.
My husband chose Brachytherapy - if you have any questions, I'd be happy to try and answer them.