Hi there,
I've been following this site for a couple of months now however this is my first post.
My father was diagnosed at the age of 56 only 3 months ago with metastatic prostae cancer. Like you the initial feeling is that of overwhelming doom and fear, however, that soon eases once you come to evaluate the dilemma and situation for what it is and I see that as, although an incurable disease, a well manageable illness. If you take some time to look at stories from people on this site you will see that there most certainly is hope and that all is not lost. Just because the disease is no longer curable doesn't mean that the end is anywhere near!
My father initially started hormone therapy every 3 months and has just received his 2nd cycle of chemo. Words like chemo initially spike fear in our hearts, however the build up was more daunting than the actually treatment, I know he still has another 4 cycles but so far, touch wood, his symptoms have been minimal. My father's urologist and oncologist have both reassured him that he has plenty of life left in him yet!
To answer your question with regards to coping I would suggest keeping away from Dr Google! This forum is fantastic and the people that use it are an inspiration, and although I haven't commented until today, they're posts have been very comforting.
Don't see this chapter in life as something devastating see it as an opportunity to reevaluate what is important.
I would advise to be open with your dad and discuss things. Once the dust has settled I am sure you you feel alot more positive.
I wish you, your father and family well and all those on this forum.
All the best