I am so sorry for your losses. I hope you have therapist and perhaps a psychiatrist to help you during your season of loss. Some medication may be in order to help you rise above your understandable feelings of sadness and depression.
It is an awful feeling to realize how isolated we are when our spouses leave us. I am in the same situation only with two little children. I shave to force myself out of bed each day, find something anything to do to stay out of bed and cry.
I have vowed to redouble my efforts at work when I return. I have been every unfocused lately and that has to stop. It will do good to focus on something other than my situation.
Can you focus on something? Church activities, school volunteering, hospital volunteering? Do you work outside of the home? Try to find something to keep you mind from going to dark places.
We will get past this - I will hold your hand if you hold mine.