This is a very tough time for the guy that has been moving through life feeling pretty much in control of his destiny, the pillar of strength, knight in shinning armor, etc., and so on. Then one day comes this PCa, and everything has changed in his world. This is something he can't personally fix, and that is a very frightening prospect.
When I look back 7 months this is the feeling I experienced, and although I tried to appear stoic and controled that was not the case. Jane and the kids were the ones that caught the frustration I was feeling for my own sense of helplessness. Lucky for me they knew what I was up to and with their patience and strength they brought me through this recovery. Then I pitched them a curve, and had 2 hernia opperations as a bonus. I really have no idea why they put up with me; except that I'm just dumb-lucky.
I hope this will help a little to explain why guys act so irrationally sometimes.