Mike, We have an ongoing thread here : New Thread For Loved Ones Left Behind. You may find it helpful from what others have shared:viewtopic.php?f=1&t=46183&start=285
(looks like Lee & I were posting @ the same time)
First off...my condolences to you & your daughters for the unexpected loss of your wife. Loss is so difficult under any circumstance of course; grieving so personal.
Caregivers have a hand in everything; an immense responsibility to & for the life of a loved one & those who love them. Sometimes we may feel we failed them in some way, yet in all reality we championed them. Maybe that is a part of survivor's guilt. Why am I still here you ask? Because she needed you to walk her journey w/her?
Difficult as it is to accept, there are some things we will never have the answers to. Depending on how one believes, we find ways to accept that it is not for us to know or choose. Painful as it is, grief is a process. Not something to "get over", yet will lessen w/time.
The rest of my post disappeared so will end w/sending my best wishes to you & your family in healing. So many of us understand your deep sadness.