Just write stuff out... write it out as you feel it, reread it, write some more, edit it, write and edit, keep writing to yourself.
You will never be the person you were before, you are someone else now, you need to learn who that is.
My daughter wrote...
When you lose a parent you lost the past When you lose a spouse you lost the present When you lose a child you lost the future When you lose a sibling you lost all three
