I am so sorry for your loss, I know how you feel, my husband died 4 months after been diagnosed, I was in shock trying to understand what had happened.
Do you have someone you could talk to, someone to help you with things? I remember going around and around and wanting night to come for if I could fall asleep it was no pain for a few hours, I was unable to find energy or motivation until I found a widow group, it did not take the pain away however it helped me.
Some of the people in the group were further in their grief journey and gave me so much support, they were angels, please see if there is such a group where you live.
You have to try and be gentle with yourself, grief has many stages and at time we think we cannot go on, that we do not belong, we feel alien to the world and the friends we knew, all this is part of grieving, just take ione step at a time, try to do one thing at a time and if you do not manage to do it, well it does not matter, tomorrow or the day after may be in a week you will.
My thoughts are with you