Cindy,
my wife had a nervous breakdown in my post Tx phase, she didn't think I was going to make it. She suffers from PTSD and chronic depression so she was already well medicated. I was pretty beat up after the end of treatment (I am a week shy of 2 years post Tx now). My anger and occasional verbal abusiveness (which I don't even remember) didn't help matters either. She really needed some space for her own sanity.

Being a little more transparent with your closest friends might be helpful for you also. There is a lot of therapy to be gained in venting. They still won't be able to relate unless they have been in your shoes.

What you are experiencing are the stages of grief, not because he may or may nor survive, but because you are greiving your previous pre-cancer life together. Some counseling and/or a support group would really benefit you right now.

The 5 stages of grief are denial, rage & anger, bargaining, depression, and finally acceptance. Please note that they won't necessarily come in order and some may occur simultaneously.