When I was going through my treatment, I posted daily about what I was going through both physically and emotionally. I was so scared about what was going to happen, you hear so many horrendous stories. As it happens, I didn't find it anywhere near as hard as I thought it was going to bend and I'm here, 15 months or so later and apart from some very minor niggles, I am the same as I've ever been.
I've put the link to my posts above in case anyone wants to have a read - it may take some of the fear away from you x
I posted through my brachytherapy treatment too - I'll share the link in the next comment.