I am so sorry to hear this terrible news.
My own Mum died at 68, in a similar way to your own.
There is nothing anyone can say to take your pain away at this time.
However, although it is a cliche, time IS a great healer.
You will never forget the pain, but you will learn to cope.
If you want to chat e-mail me (in trust) and I'll gladly provide my phone number.
My thoughts are with you at this very difficult time.
Hussman